Bug Materials don't load properly when using "Use Existing Build" play mode script

Hi there! We're finding that "Use Existing Build" isn't loading materials properly on WebGL.
The scene shown here ("Home") is hosted on a server and loaded via Addressables - but the sprite materials (as well as a particle system and another custom shader) are all showing with the default pink "broken shader" color.

You'll notice that there's a warning stating "Material does not have a _MainTex texture property" and some errors (Assertion failed on expression: 'request.key.guid.IsValid()') spamming the log (these only show when the material inspector is expanded).

These errors can be fixed by removing and re-adding the material, or changing the shader back and forth - but obviously this means it's no longer using the downloaded material!

Should we assume this is covered by the warning "Asset bundles built with build target WebGL may not be compatible with running in the Editor."?

 

Was this ever resolved?? +1

 

After banging my head on this issue for a long time may I suggest you please add this to the documentation.

For examples, loading addressable scenes in WebGL + URP is basically impossible in this mode.

 

So is there any way to solve this problem?