MultiMeshInstance3D not showing in play

[Wiggan]

Godot version

4.0 RC1

System information

Windows10, AMD Ryzen 9 5900X, NVIDIA GeForce RTX 3060 Ti, driver version 30.0.15.1179, forward+.

Issue description

One of 4 MultiMeshInstance3D instance I had in my scene did not show anything in play. It shows fine in editor and camera preview. I tried changing what mesh to instance, no difference.
As far as I can tell, there is nothing that is different from this instance compared to the others.

Steps to reproduce

Load up the project and press play.

Minimal reproduction project

MultiMeshInstanceREPEX.zip

[RedMser]

Can reproduce, very weird bug... Some things I tried (nothing helped understand it though):

• Rename node.
• Create new multimesh node and copy buffer / mesh info across (it renders fine).
• Change which mesh is instanced (it still does not render).
• Copy another multimesh's buffer to the broken multimesh (still doesn't render).
• Delete .godot folder.

Maybe needs deeper debugging, but I don't see any reason why this particular node does not work, even if copying / changing all of its properties... 🤯

[clayjohn]

Funny enough, this is a bug with TAA. Turning off TAA in the test project fixes the issue

[clayjohn]

Duplicate of #67287