### 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
for (EditedShader &edited_shader : edited_shaders) {
		if (edited_shader.shader_editor) {
			edited_shader.shader_editor->save_external_data();
		}
	}
	_update_shader_list();
}
void ShaderEditorPlugin::apply_changes() {
	for (EditedShader &edited_shader : edited_shaders) {
		if (edited_shader.shader_editor) {
			edited_shader.shader_editor->apply_shaders();
		}
	}
}
void ShaderEditorPlugin::_shader_selected(int p_index) {
	if (p_index >= (int)edited_shaders.size()) {
		return;
	}
	if (edited_shaders[p_index].shader_editor) {
		edited_shaders[p_index].shader_editor->validate_script();
	}
	shader_tabs->set_current_tab(p_index);
	shader_list->select(p_index);
}
void ShaderEditorPlugin::_shader_list_clicked(int p_item, Vector2 p_local_mouse_pos, MouseButton p_mouse_button_index) {
	if (p_mouse_button_index == MouseButton::MIDDLE) {
		_close_shader(p_item);
	}
}
void ShaderEditorPlugin::_close_shader(int p_index) {