three.js WebGPURenderer support with `forceWebGL` enabled

[marwie]

Hello,

Problem
Sparkjs currently fails when trying to use three.js WebGPURenderer with webgl fallback enabled.

Question
Are there plans for supporting three.js WebGPURenderer with forceWebGL enabled?
For example with new WebGPURenderer({ forceWebGL: true, }) - so I'm not asking about full webgpu support right now (altough I'd be interested in plans for it as well)

Errors

Uncaught (in promise) TypeError: Invalid value used as weak map key
    at WeakMap.set (<anonymous>)
    at WebGLBackend.get (Backend.js:764:14)
    at WebGLTextureUtils.copyTextureToBuffer (WebGLTextureUtils.js:1225:57)
    at WebGLBackend.copyTextureToBuffer (WebGLBackend.js:1425:28)
    at WebGPURenderer.readRenderTargetPixelsAsync (Renderer.js:3065:23)
    at _SparkRenderer.readbackDepth (SparkRenderer.ts:1702:32)
    at _SparkRenderer.driveSort (SparkRenderer.ts:1012:16)
    at async _SparkRenderer.updateInternal (SparkRenderer.ts:965:5)

THREE.NodeBuilder: Material "RawShaderMaterial" is not compatible
  | error | @ | utils.js:321
  | prebuild | @ | NodeBuilder.js:3153
  | build | @ | NodeBuilder.js:3176
  | getForRender | @ | NodeManager.js:268
  | getNodeBuilderState | @ | RenderObject.js:403
  | getMonitor | @ | RenderObject.js:414
  | needsRefresh | @ | NodeManager.js:1011
  | _renderObjectDirect | @ | Renderer.js:3710
  | renderObject | @ | Renderer.js:3634
  | _renderObjects | @ | Renderer.js:3322
  | _renderScene | @ | Renderer.js:1754
  | render | @ | Renderer.js:1370
  | render | @ | Pass.js:168
  | generate | @ | SplatAccumulator.ts:424
  | (anonymous) | @ | SplatAccumulator.ts:575
  | updateInternal | @ | SparkRenderer.ts:938
  | onBeforeRender | @ | SparkRenderer.ts:814
  | renderObject | @ | Renderer.js:3558
  | _renderObjects | @ | Renderer.js:3322
  | _renderTransparents | @ | Renderer.js:3300
  | _renderScene | @ | Renderer.js:1755
  | render | @ | Renderer.js:1370