### 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
_free_onion_layers();
	int captures = onion.get_needed_capture_count();
	Point2 capture_size = get_tree()->get_root()->get_size();
	onion.captures.resize(captures);
	onion.captures_valid.resize(captures);
	for (int i = 0; i < captures; i++) {
		bool is_present = onion.differences_only && i == captures - 1;
		
		onion.captures.write[i] = RS::get_singleton()->viewport_create();
		RS::get_singleton()->viewport_set_size(onion.captures[i], capture_size.width, capture_size.height);
		RS::get_singleton()->viewport_set_update_mode(onion.captures[i], RS::VIEWPORT_UPDATE_ALWAYS);
		RS::get_singleton()->viewport_set_transparent_background(onion.captures[i], !is_present);
		RS::get_singleton()->viewport_attach_canvas(onion.captures[i], onion.capture.canvas);
	}
	
	RS::get_singleton()->canvas_item_clear(onion.capture.canvas_item);
	RS::get_singleton()->canvas_item_add_texture_rect(onion.capture.canvas_item, Rect2(Point2(), capture_size), get_tree()->get_root()->get_texture()->get_rid());
	onion.capture_size = capture_size;
}
void AnimationPlayerEditor::_free_onion_layers() {
	for (int i = 0; i < onion.captures.size(); i++) {
		if (onion.captures[i].is_valid()) {
			RS::get_singleton()->free(onion.captures[i]);
		}
	}
	onion.captures.clear();
	onion.captures_valid.clear();
}
void AnimationPlayerEditor::_prepare_onion_layers_1() {