### 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.
}
	if (multimesh->data_cache_dirty_regions) {
		memdelete_arr(multimesh->data_cache_dirty_regions);
		multimesh->data_cache_dirty_regions = nullptr;
		multimesh->data_cache_used_dirty_regions = 0;
	}
	
	
	int color_and_custom_strides = (p_use_colors || p_use_custom_data) ? 2 : 0;
	multimesh->instances = p_instances;
	multimesh->xform_format = p_transform_format;
	multimesh->uses_colors = p_use_colors;
	multimesh->color_offset_cache = p_transform_format == RS::MULTIMESH_TRANSFORM_2D ? 8 : 12;
	multimesh->uses_custom_data = p_use_custom_data;
	multimesh->custom_data_offset_cache = multimesh->color_offset_cache + color_and_custom_strides;
	multimesh->stride_cache = multimesh->custom_data_offset_cache + color_and_custom_strides;
	multimesh->buffer_set = false;
	multimesh->data_cache = Vector<float>();
	multimesh->aabb = AABB();
	multimesh->aabb_dirty = false;
	multimesh->visible_instances = MIN(multimesh->visible_instances, multimesh->instances);
	if (multimesh->instances) {
		glGenBuffers(1, &multimesh->buffer);
		glBindBuffer(GL_ARRAY_BUFFER, multimesh->buffer);
		GLES3::Utilities::get_singleton()->buffer_allocate_data(GL_ARRAY_BUFFER, multimesh->buffer, multimesh->instances * multimesh->stride_cache * sizeof(float), nullptr, GL_STATIC_DRAW, "MultiMesh buffer");
		glBindBuffer(GL_ARRAY_BUFFER, 0);
	}
	multimesh->dependency.changed_notify(Dependency::DEPENDENCY_CHANGED_MULTIMESH);
}
int MeshStorage::multimesh_get_instance_count(RID p_multimesh) const {