### Godot version

4.0 Beta 11

### System information

Windows 10 version 22H2, GeForce Game Ready Driver Version 528.02, GTX 1070

### Issue description

Since Beta 11 this error is given whenever a project is run in the forward+ renderer with OpenXR enabled. This error is not present with Beta 10 and previous versions.
![image](https://user-images.githubusercontent.com/38119387/212044209-1179b908-f010-47a1-ae53-bc2faadc30de.png)

I've tested with projects created in previous versions as well as the current version (Beta 11)

### Steps to reproduce

Create project, enable OpenXR in project settings, and run.

### Minimal reproduction project

N/A
ERR_FAIL_COND_V(!running, false);
	ERR_FAIL_NULL_V(graphics_extension, false);
	
	if (frame_state.predictedDisplayTime == 0) {
		return false;
	}
	
	if (views == nullptr || !view_pose_valid) {
		return false;
	}
	
	if (depth_views != nullptr) {
		for (uint32_t i = 0; i < view_count; i++) {
			depth_views[i].nearZ = p_z_near;
			depth_views[i].farZ = p_z_far;
		}
	}
	
	return graphics_extension->create_projection_fov(views[p_view].fov, p_z_near, p_z_far, p_camera_matrix);
}
bool OpenXRAPI::poll_events() {