Skeleton meshes not updating in XR modes under gl_compatibility

[Malcolmnixon]

Godot version

4.1.1

System information

Meta Quest 2 - GLES3

Issue description

When writing VR applications on Godot 4 using gl_compatibility, skeleton-driven meshes like hands are often rendered corrupted, or sometimes update slowly.

Steps to reproduce

The godot-xr-tools demo projects have these issues in the climbing/gliding and pointer-demo scenes if the project is switched to gl_compatibility mode and run on a mobile VR headset.

Minimal reproduction project

The godot-xr-tools demo project has been the testing project for this issue.