### Godot version

v4.2.beta2.official [f8818f85e]

### System information

Windows 10, 64bit

### Issue description

Some times can't add node in visualshader editor

### Steps to reproduce

1. Open a VisualShader file for edit.
2. Click the `Add Node...` button, it will popup menu, it is OK.
3. Direct close the menu.
4. Clikd the `Add Node...` again, the menu can't popup.
![GIF](https://github.com/godotengine/godot/assets/35988767/1326c63e-3e05-4423-9ec7-7ce305b3f4f5)

### Minimal reproduction project

/
VisualShader::Type type = get_current_shader_type();
	Ref<VisualShaderNode> node = visual_shader->get_node(type, p_node);
	ERR_FAIL_COND(!node.is_valid());
	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
	if (p_expand) {
		undo_redo->create_action(TTR("Expand Output Port"));
	} else {
		undo_redo->create_action(TTR("Shrink Output Port"));
	}
	undo_redo->add_do_method(node.ptr(), "_set_output_port_expanded", p_port, p_expand);
	undo_redo->add_undo_method(node.ptr(), "_set_output_port_expanded", p_port, !p_expand);
	int type_size = 0;
	switch (node->get_output_port_type(p_port)) {
		case VisualShaderNode::PORT_TYPE_VECTOR_2D: {
			type_size = 2;
		} break;
		case VisualShaderNode::PORT_TYPE_VECTOR_3D: {
			type_size = 3;
		} break;
		case VisualShaderNode::PORT_TYPE_VECTOR_4D: {