### 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
for (uint32_t i = 0; i < num_supported_extensions; i++) {
		if (supported_extensions[i].extensionName == p_extension) {
			return true;
		}
	}
	return false;
}
bool OpenXRAPI::is_extension_enabled(const String &p_extension) const {
	CharString extension = p_extension.ascii();
	for (int i = 0; i < enabled_extensions.size(); i++) {
		if (strcmp(enabled_extensions[i].ptr(), extension.ptr()) == 0) {
			return true;
		}
	}
	return false;
}
bool OpenXRAPI::is_top_level_path_supported(const String &p_toplevel_path) {