### 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_NULL_V(supported_swapchain_formats, false);
	for (uint32_t i = 0; i < num_swapchain_formats; i++) {
		if (supported_swapchain_formats[i] == p_swapchain_format) {
			return true;
		}
	}
	return false;
}
bool OpenXRAPI::create_swapchains() {
	ERR_FAIL_NULL_V(graphics_extension, false);
	ERR_FAIL_COND_V(session == XR_NULL_HANDLE, false);
	/*
		TODO: We need to improve on this, for now we're taking our old approach of creating our main swapchains and substituting
		those for the ones Godot normally creates.
		This however means we can only use swapchains for our main XR view.
		It would have been nicer if we could override the swapchain creation in Godot with ours but we have a timing issue here.
		We can't create XR swapchains until after our XR session is fully instantiated, yet Godot creates its swapchain much earlier.
		Also Godot only creates a swapchain for the main output.
		OpenXR will require us to create swapchains as the render target for additional viewports if we want to use the layer system
		to optimise text rendering and background rendering as OpenXR may choose to re-use the results for reprojection while we're
		already rendering the next frame.
		Finally an area we need to expand upon is that Foveated rendering is only enabled for the swap chain we create,
		as we render 3D content into internal buffers that are copied into the swapchain, we do now have (basic) VRS support