Bundle multimaterial not updated correctly

[Makio64]

Description

Not sure its a bug or if it's limited by the api but in a bundle static if i update materials of the meshs inside only the first material is updated.

it does work if i call bundle.needsUpdate or if bundle.static = false

Reproduction steps

1. create a bundle and add multiple mesh with differents material
2. update opacity / color of the materials
3. only first one is updated

Code

    let group = new THREE.BundleGroup()
    // mesh
    for(let i=0; i<10; i++){
      
      // material
      const material = new THREE.MeshBasicMaterial( {
        color: new THREE.Color(THREE.MathUtils.randInt(0,0xffffff)), 
        transparent: true,
        opacity:Math.random(),
        depthWrite:false
      } );
      
      
      const mesh = new THREE.Mesh( geometry, material );
      
      mesh.position.set(
        -5 + i,
        0,
        0
      )
      group.add( mesh )
      setInterval(()=>{
        material.opacity = Math.random()
      	//group.needsUpdate = true
      }, 100 + Math.random()*500)
    }
    //group.needsUpdate = true
    group.static = true
    scene.add( group );

Live example

https://jsfiddle.net/8z5qb9xs/15/

Screenshots

No response

Version

r174 dev

Device

No response

Browser

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OS

No response

[Makio64]

Note : Maybe in the renderBundle performance example dynamic options should be rename as static, as its the name of the property ?

Note 2 : It's a suggestions but add a little button ? over the one to see the code source< > with short explaination of the examples would be great to understand whats happening. ( can be another issue )