### Godot version

any version after 74458b6

### System information

Linux x64, but likely irrelevant

### Issue description

OpenXR action maps are not properly exported in recent builds of Godot 4: the `.res` file is small and does no longer seem to contain anything of use. In-game, no actions are passed on to OpenXR (obviously).

I bisected the issue down to https://github.com/godotengine/godot/commit/74458b6e9bed0f28db3374c7406eacbcf4b09b9d, which was merged in #70377.

### Steps to reproduce

1. Delete any previous export files (`.godot/exported/*/*.pkg`)
2. Perform an export (I did one for Android, but it likely works with anything)
3. Observe OpenXR actions not working in the export (error spam 'sync_action_sets: Condition "active_sets.size() == 0"'), and the exported action map file being very small (`.godot/exported/*/*.pkg`, from a few tens of kilobytes down to 296 bytes)

### Minimal reproduction project

Any OpenXR project can be used, such as https://github.com/BastiaanOlij/godot4_openxr_demo
if (err != OK) {
			return err;
		}
	}
	
	if (TS->has_feature(TextServer::FEATURE_USE_SUPPORT_DATA)) {
		bool use_data = GLOBAL_GET("internationalization/locale/include_text_server_data");
		if (use_data) {
			
			String ts_data = "res://" + TS->get_support_data_filename();
			if (FileAccess::exists(ts_data)) {
				Vector<uint8_t> array = FileAccess::get_file_as_bytes(ts_data);
				err = p_func(p_udata, ts_data, array, idx, total, enc_in_filters, enc_ex_filters, key);
				if (err != OK) {
					return err;
				}
			} else {
				
				String icu_data_file = EditorPaths::get_singleton()->get_cache_dir().path_join("tmp_icu_data");
				if (!TS->save_support_data(icu_data_file)) {
					return ERR_INVALID_DATA;
				}
				Vector<uint8_t> array = FileAccess::get_file_as_bytes(icu_data_file);
				err = p_func(p_udata, ts_data, array, idx, total, enc_in_filters, enc_ex_filters, key);
				DirAccess::remove_file_or_error(icu_data_file);
				if (err != OK) {
					return err;
				}
			}
		}