First, I want to say that I just switch to V4 and it worked perfectly well. No big corrections or adjustments needed so thanks for the amazing work!
Yet I have an error showing when using faceColor on a mesh and a GlowLayer in the scene. It doesn’t break anything but there is an issue showing in the console which I don’t understand.
Here is a playground: https://www.babylonjs-playground.com/index.html#CWPN2T#57