### Godot version

4.0 fb10f45

### System information

Windows 10 x64

### Issue description

Behold, empty TileSet editor, with no TileMap node nor bottom button visible:
![image](https://github.com/godotengine/godot/assets/2223172/0f052770-4946-40eb-a790-a995dbe2599c)
Regression from #72277 (most likely, I didn't test)

### Steps to reproduce

1. Add some Node to your scene
2. Add a TileMap as a child
3. Select TileMap
4. Fold its parent in the scene tree
5. Restart the editor
6. The TileMap selection is restored and so is the folded node, resulting in a weird paradox

### Minimal reproduction project

N/A
int64_t cur_frame = get_tree()->get_frame();
	if (cur_frame == onion.last_frame) {
		return;
	}
	if (!onion.enabled || !is_processing() || !is_visible() || !get_player()) {
		_stop_onion_skinning();
		return;
	}
	onion.last_frame = cur_frame;
	
	onion.can_overlay = false;
	plugin->update_overlays();
	if (player->is_playing()) {
		return;
	}
	
	call_deferred(SNAME("_prepare_onion_layers_2"));
}
void AnimationPlayerEditor::_prepare_onion_layers_1_deferred() {
	call_deferred(SNAME("_prepare_onion_layers_1"));
}
void AnimationPlayerEditor::_prepare_onion_layers_2() {