If a DecoratorNode is selected and I press Backspace, if there are two or more DecoratorNodes in a row, two of them are deleted at once.

Lexical version: 0.27.0

Steps To Reproduce

1. Go to the Lexical Playground
2. Insert a Horizontal Rule
3. Press left arrow so that it's selected
4. Copy it
5. Press right arrow to deselect the hr
6. Paste two times (for a total of 3 hrs)
7. This should result in this state:

 root
  ├ (95) paragraph 
  ├ (96) horizontalrule 
  ├ (98) horizontalrule 
  └ (100) horizontalrule 

8. Now select the bottommost horizontal rule

• As an aside, pressing left arrow from the bottom of the editor seems to select the center hr at first

9. Press backspace
10. Only one should be deleted, but instead two are deleted, leaving the topmost one

This also occurs with pressing the Delete key when selecting either the top or middle hr; the next two hrs are deleted.

The current behavior

Two hrs are deleted at a time in the case described above

The expected behavior

Only one hr is deleted

Impact of fix

I pointed to the playground and used hrs to illustrate the example, but we're using custom DecoratorNodes in our application (that use the same $onDelete logic as LexicalHorizontalRuleNode) and this leads to surprising behavior for users when multiple are deleted at once. In the case of just two DecoratorNodes back to back, there is a workaround by selecting just one and either pressing Delete or Backspace to force a single node at the edge to be deleted, but we wouldn't expect users to be aware of how to do that.