diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_d.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_d.csproj
index f8177935821665..6a95c1384f48f7 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_d.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_d.csproj
@@ -6,6 +6,7 @@
     <DebugType>Full</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="lcs2.cs" />
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_do.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_do.csproj
index b862db8362a801..97ba087b1345d2 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_do.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_do.csproj
@@ -6,6 +6,7 @@
     <DebugType>Full</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="lcs2.cs" />
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_r.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_r.csproj
index 6b7ddc76b585d7..cdb1d1113f5a39 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_r.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_r.csproj
@@ -6,6 +6,7 @@
     <DebugType>None</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="lcs2.cs" />
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_ro.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_ro.csproj
index d48435b7572c1a..7a6e5ca62250b7 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcs2_ro.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcs2_ro.csproj
@@ -6,6 +6,7 @@
     <DebugType>None</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="lcs2.cs" />
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_d.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_d.csproj
index 4064bb61053fb1..2e1feb0efa4005 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_d.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_d.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_do.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_do.csproj
index 4a16f2c23b1493..2949869204e6fe 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_do.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_do.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_r.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_r.csproj
index adda62bc6c1deb..bdc82def79fab9 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_r.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_r.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_ro.csproj b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_ro.csproj
index cfc3527f000d00..4e01bcf3fe7423 100644
--- a/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_ro.csproj
+++ b/src/tests/JIT/Methodical/Arrays/lcs/lcsvalbox_ro.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_d.ilproj b/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_d.ilproj
index 929b3b57d8ac3b..8c3599c2020733 100644
--- a/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_d.ilproj
+++ b/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_d.ilproj
@@ -4,6 +4,7 @@
     <RestorePackages>true</RestorePackages>
     <!-- The test leaves a secondary thread running -->
     <UnloadabilityIncompatible>true</UnloadabilityIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_r.ilproj b/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_r.ilproj
index e9cf0649b16841..5981dcb44156e4 100644
--- a/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_r.ilproj
+++ b/src/tests/JIT/Methodical/Boxing/misc/concurgc_il_r.ilproj
@@ -4,6 +4,7 @@
     <RestorePackages>true</RestorePackages>
     <!-- The test leaves a secondary thread running -->
     <UnloadabilityIncompatible>true</UnloadabilityIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/src/tests/JIT/Methodical/ELEMENT_TYPE_IU/u_conv_il_r.ilproj b/src/tests/JIT/Methodical/ELEMENT_TYPE_IU/u_conv_il_r.ilproj
index 85643608c575f3..ffa1af315bc25c 100644
--- a/src/tests/JIT/Methodical/ELEMENT_TYPE_IU/u_conv_il_r.ilproj
+++ b/src/tests/JIT/Methodical/ELEMENT_TYPE_IU/u_conv_il_r.ilproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
     <MonoAotIncompatible>true</MonoAotIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>PdbOnly</DebugType>
diff --git a/src/tests/JIT/Methodical/VT/port/lcs_gcref_d.csproj b/src/tests/JIT/Methodical/VT/port/lcs_gcref_d.csproj
index ffe120f0e9630a..240643178cd29b 100644
--- a/src/tests/JIT/Methodical/VT/port/lcs_gcref_d.csproj
+++ b/src/tests/JIT/Methodical/VT/port/lcs_gcref_d.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/VT/port/lcs_gcref_do.csproj b/src/tests/JIT/Methodical/VT/port/lcs_gcref_do.csproj
index 1ade25a0e043fd..100c5f4ee4c149 100644
--- a/src/tests/JIT/Methodical/VT/port/lcs_gcref_do.csproj
+++ b/src/tests/JIT/Methodical/VT/port/lcs_gcref_do.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/VT/port/lcs_gcref_r.csproj b/src/tests/JIT/Methodical/VT/port/lcs_gcref_r.csproj
index 7f3b9ca6f8203b..1d3203deb35ddc 100644
--- a/src/tests/JIT/Methodical/VT/port/lcs_gcref_r.csproj
+++ b/src/tests/JIT/Methodical/VT/port/lcs_gcref_r.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/VT/port/lcs_gcref_ro.csproj b/src/tests/JIT/Methodical/VT/port/lcs_gcref_ro.csproj
index 8d8c3e22c1cd75..cd7fdafdade05a 100644
--- a/src/tests/JIT/Methodical/VT/port/lcs_gcref_ro.csproj
+++ b/src/tests/JIT/Methodical/VT/port/lcs_gcref_ro.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_d.csproj b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_d.csproj
index b6edebbbe1253d..546026415acbea 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_d.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_d.csproj
@@ -7,6 +7,7 @@
     <DebugType>Full</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray1.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_do.csproj b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_do.csproj
index 612819361c9fc5..d79cee69bb8ca8 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_do.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_do.csproj
@@ -7,6 +7,7 @@
     <DebugType>Full</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray1.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_r.csproj b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_r.csproj
index ccf13400948d52..fe9f046e86d859 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_r.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_r.csproj
@@ -7,6 +7,7 @@
     <DebugType>None</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray1.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_ro.csproj b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_ro.csproj
index 2cd50edb2df118..34569c6a348f05 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray1_cs_ro.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray1_cs_ro.csproj
@@ -7,6 +7,7 @@
     <DebugType>None</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray1.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_d.csproj b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_d.csproj
index 1fbe4db35aa8bd..d2de785b2e08e5 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_d.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_d.csproj
@@ -6,6 +6,7 @@
     <DebugType>Full</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray2.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_do.csproj b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_do.csproj
index 873dfccc7ed70e..bd68bbf7c08e9a 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_do.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_do.csproj
@@ -6,6 +6,7 @@
     <DebugType>Full</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray2.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_r.csproj b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_r.csproj
index 9e7f6122a9e573..97fe762fbd6254 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_r.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_r.csproj
@@ -6,6 +6,7 @@
     <DebugType>None</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray2.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_ro.csproj b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_ro.csproj
index 6f8b6739153a82..4feb7e57ea32d8 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray2_cs_ro.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray2_cs_ro.csproj
@@ -6,6 +6,7 @@
     <DebugType>None</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray2.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_d.csproj b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_d.csproj
index eeb6dfc37d0f77..07898a5a38a979 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_d.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_d.csproj
@@ -7,6 +7,7 @@
     <DebugType>Full</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray3.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_do.csproj b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_do.csproj
index 13631f4e868ba7..db0857bfd1388a 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_do.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_do.csproj
@@ -6,6 +6,7 @@
     <DebugType>Full</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray3.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_r.csproj b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_r.csproj
index 30a0cc66a98f90..689064ec6f5ac7 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_r.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_r.csproj
@@ -7,6 +7,7 @@
     <DebugType>None</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray3.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_ro.csproj b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_ro.csproj
index 82360363951250..288c9a8946f103 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray3_cs_ro.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray3_cs_ro.csproj
@@ -7,6 +7,7 @@
     <DebugType>None</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray3.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_d.csproj b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_d.csproj
index 260b9d8416095b..1d394f4092124e 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_d.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_d.csproj
@@ -7,6 +7,7 @@
     <DebugType>Full</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray4.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_do.csproj b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_do.csproj
index 20755c263865f2..aac2d464156085 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_do.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_do.csproj
@@ -7,6 +7,7 @@
     <DebugType>Full</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray4.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_r.csproj b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_r.csproj
index a2f33c465faaa3..1b264880a492a3 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_r.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_r.csproj
@@ -7,6 +7,7 @@
     <DebugType>None</DebugType>
     <Optimize>False</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray4.cs" />
diff --git a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_ro.csproj b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_ro.csproj
index 5de192b13e1538..9349afd5cb5694 100644
--- a/src/tests/JIT/Methodical/doublearray/dblarray4_cs_ro.csproj
+++ b/src/tests/JIT/Methodical/doublearray/dblarray4_cs_ro.csproj
@@ -7,6 +7,7 @@
     <DebugType>None</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="dblarray4.cs" />
diff --git a/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_d.ilproj b/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_d.ilproj
index 672ad9b544dd29..33f66568eaecdd 100644
--- a/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_d.ilproj
+++ b/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_d.ilproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
     <MonoAotIncompatible>true</MonoAotIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_r.ilproj b/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_r.ilproj
index 85b1aa395cdcd7..f0168f105ce274 100644
--- a/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_r.ilproj
+++ b/src/tests/JIT/Methodical/eh/deadcode/deadoponerrorinfunclet_il_r.ilproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
     <MonoAotIncompatible>true</MonoAotIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>PdbOnly</DebugType>
diff --git a/src/tests/JIT/Methodical/explicit/basic/refarg_i1_d.csproj b/src/tests/JIT/Methodical/explicit/basic/refarg_i1_d.csproj
index 136e1bb1e2d003..2cdc5ac001d17c 100644
--- a/src/tests/JIT/Methodical/explicit/basic/refarg_i1_d.csproj
+++ b/src/tests/JIT/Methodical/explicit/basic/refarg_i1_d.csproj
@@ -3,6 +3,7 @@
     <OutputType>Exe</OutputType>
     <!-- TestAssemblyLoadContext.Load called from the finalizer -->
     <UnloadabilityIncompatible>true</UnloadabilityIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/src/tests/JIT/Methodical/explicit/basic/refarg_i1_r.csproj b/src/tests/JIT/Methodical/explicit/basic/refarg_i1_r.csproj
index ddf64e624ef2b4..b2d49e55ebabdb 100644
--- a/src/tests/JIT/Methodical/explicit/basic/refarg_i1_r.csproj
+++ b/src/tests/JIT/Methodical/explicit/basic/refarg_i1_r.csproj
@@ -3,6 +3,7 @@
     <OutputType>Exe</OutputType>
     <!-- TestAssemblyLoadContext.Load called from the finalizer -->
     <UnloadabilityIncompatible>true</UnloadabilityIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>
diff --git a/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_d.csproj b/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_d.csproj
index d9e03b8c1d2927..a7c5e0167906b5 100644
--- a/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_d.csproj
+++ b/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_d.csproj
@@ -4,6 +4,7 @@
     <!-- NOTE: this test simply takes too long to complete under GC stress/heap verify; it is not fundamentally incompatible -->
     <GCStressIncompatible Condition="'$(TargetArchitecture)' == 'x86'">true</GCStressIncompatible>
     <HeapVerifyIncompatible>true</HeapVerifyIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_r.csproj b/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_r.csproj
index 164352e001623f..9081d94894ad20 100644
--- a/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_r.csproj
+++ b/src/tests/JIT/Methodical/fp/exgen/10w5d_cs_r.csproj
@@ -4,6 +4,7 @@
     <!-- NOTE: this test simply takes too long to complete under GC stress/heap verify; it is not fundamentally incompatible -->
     <GCStressIncompatible Condition="'$(TargetArchitecture)' == 'x86'">true</GCStressIncompatible>
     <HeapVerifyIncompatible>true</HeapVerifyIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/refany/stress1_d.csproj b/src/tests/JIT/Methodical/refany/stress1_d.csproj
index 0497150fc0467d..4e5235c0d93ec4 100644
--- a/src/tests/JIT/Methodical/refany/stress1_d.csproj
+++ b/src/tests/JIT/Methodical/refany/stress1_d.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/refany/stress1_r.csproj b/src/tests/JIT/Methodical/refany/stress1_r.csproj
index 5a3bab08bacf90..2dda3fc499c760 100644
--- a/src/tests/JIT/Methodical/refany/stress1_r.csproj
+++ b/src/tests/JIT/Methodical/refany/stress1_r.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/refany/stress1_ro.csproj b/src/tests/JIT/Methodical/refany/stress1_ro.csproj
index d58cad78e9d332..ef91ffa5aede7d 100644
--- a/src/tests/JIT/Methodical/refany/stress1_ro.csproj
+++ b/src/tests/JIT/Methodical/refany/stress1_ro.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
diff --git a/src/tests/JIT/Methodical/refany/virtcall_d.csproj b/src/tests/JIT/Methodical/refany/virtcall_d.csproj
index a38e7a515935e0..536ca74c2b1a8f 100644
--- a/src/tests/JIT/Methodical/refany/virtcall_d.csproj
+++ b/src/tests/JIT/Methodical/refany/virtcall_d.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/refany/virtcall_do.csproj b/src/tests/JIT/Methodical/refany/virtcall_do.csproj
index d118078ea2b083..ec0b79b32de784 100644
--- a/src/tests/JIT/Methodical/refany/virtcall_do.csproj
+++ b/src/tests/JIT/Methodical/refany/virtcall_do.csproj
@@ -2,6 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Full</DebugType>
diff --git a/src/tests/JIT/Methodical/refany/virtcall_r.csproj b/src/tests/JIT/Methodical/refany/virtcall_r.csproj
index 25ae1a0340d9e0..870ca06653aa74 100644
--- a/src/tests/JIT/Methodical/refany/virtcall_r.csproj
+++ b/src/tests/JIT/Methodical/refany/virtcall_r.csproj
@@ -2,11 +2,11 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>None</DebugType>
     <Optimize>False</Optimize>
-    <GCStressIncompatible>true</GCStressIncompatible>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="virtcall.cs" />
diff --git a/src/tests/JIT/Methodical/refany/virtcall_ro.csproj b/src/tests/JIT/Methodical/refany/virtcall_ro.csproj
index 58623d0d1005e4..2cc0da9de7ed29 100644
--- a/src/tests/JIT/Methodical/refany/virtcall_ro.csproj
+++ b/src/tests/JIT/Methodical/refany/virtcall_ro.csproj
@@ -6,6 +6,7 @@
     <DebugType>None</DebugType>
     <Optimize>True</Optimize>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="virtcall.cs" />
diff --git a/src/tests/JIT/Methodical/tailcall/Desktop/thread-race_r.csproj b/src/tests/JIT/Methodical/tailcall/Desktop/thread-race_r.csproj
index 0034e4ae22cde3..e63ee8ab4ea44d 100644
--- a/src/tests/JIT/Methodical/tailcall/Desktop/thread-race_r.csproj
+++ b/src/tests/JIT/Methodical/tailcall/Desktop/thread-race_r.csproj
@@ -3,6 +3,7 @@
     <!-- NOTE: this test simply takes too long to complete under heap verify or GCStress. It is not fundamentally incompatible. -->
     <HeapVerifyIncompatible>true</HeapVerifyIncompatible>
     <GCStressIncompatible>true</GCStressIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
     <IsLongRunningGCTest>true</IsLongRunningGCTest>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
diff --git a/src/tests/JIT/Methodical/tailcall_v4/hijacking.ilproj b/src/tests/JIT/Methodical/tailcall_v4/hijacking.ilproj
index da27e6f81deaf2..3482e7bb829cff 100644
--- a/src/tests/JIT/Methodical/tailcall_v4/hijacking.ilproj
+++ b/src/tests/JIT/Methodical/tailcall_v4/hijacking.ilproj
@@ -6,6 +6,7 @@
     <GCStressIncompatible Condition="'$(TargetArchitecture)' == 'arm64' and '$(TargetOS)' == 'OSX'">true</GCStressIncompatible>
     <!-- NOTE: this test simply takes too long to complete under heap verify. It is not fundamentally incompatible. -->
     <HeapVerifyIncompatible Condition="'$(TargetArchitecture)' == 'x86'">true</HeapVerifyIncompatible>
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>PdbOnly</DebugType>