### 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

/
if (dist) {
			ERR_FAIL_COND(p_ops[0].get_type() != Variant::INT);
			dist->set_op_type((VisualShaderNodeVectorDistance::OpType)(int)p_ops[0]);
			return;
		}
	}
	
	{
		VisualShaderNodeDerivativeFunc *derFunc = Object::cast_to<VisualShaderNodeDerivativeFunc>(p_node);
		if (derFunc) {
			ERR_FAIL_COND(p_ops[0].get_type() != Variant::INT);
			ERR_FAIL_COND(p_ops[1].get_type() != Variant::INT);
			derFunc->set_function((VisualShaderNodeDerivativeFunc::Function)(int)p_ops[0]);
			derFunc->set_op_type((VisualShaderNodeDerivativeFunc::OpType)(int)p_ops[1]);
			return;
		}
	}
	
	{
		VisualShaderNodeMix *mix = Object::cast_to<VisualShaderNodeMix>(p_node);
		if (mix) {
			ERR_FAIL_COND(p_ops[0].get_type() != Variant::INT);
			mix->set_op_type((VisualShaderNodeMix::OpType)(int)p_ops[0]);
			return;
		}
	}
	
	{
		VisualShaderNodeClamp *clampFunc = Object::cast_to<VisualShaderNodeClamp>(p_node);
		if (clampFunc) {