### 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
default:
				if (!handled) {
					print_verbose(String("OpenXR Unhandled event type ") + OpenXRUtil::get_structure_type_name(runtimeEvent.type));
				}
				break;
		}
		runtimeEvent.type = XR_TYPE_EVENT_DATA_BUFFER;
		pollResult = xrPollEvent(instance, &runtimeEvent);
	}
	if (pollResult == XR_EVENT_UNAVAILABLE) {
		
		return true;
	} else {
		ERR_FAIL_V_MSG(false, "OpenXR: Failed to poll events!");
	}
}
bool OpenXRAPI::process() {
	ERR_FAIL_COND_V(instance == XR_NULL_HANDLE, false);
	if (!poll_events()) {
		return false;
	}
	if (!running) {
		return false;
	}
	for (OpenXRExtensionWrapper *wrapper : registered_extension_wrappers) {
		wrapper->on_process();
	}
	return true;
}
bool OpenXRAPI::acquire_image(OpenXRSwapChainInfo &p_swapchain) {