Found something weird with the MeshInstancer. I created a very simple setup with a random array and a cube. With 0-1 instance it works, with more instances it fails with “[.WebGL-0x7f82ee06d000]GL ERROR :GL_INVALID_OPERATION : glDrawElementsInstancedANGLE: attempt to access out of range vertices in attribute 5” in the Console. Once I change the default size of the Cube it does work though, even though still hit and miss (fails when increasing instance count again).
Tested on MacOS 10.15, Chrome 81.0.4044.138