### Godot version

v4.0.beta17.mono.official [c40020513]

### System information

Window 11, Forward+, GTX 1060

### Issue description

Adding two theme variations in a row result to a  crash.

https://user-images.githubusercontent.com/93253123/217037249-1ce1d56d-beb6-4435-83ad-9f8a07fe0e96.mp4



### Steps to reproduce

1. Create a project.
2. Create a theme.
3. Double click to go in the theme editor.
4. Click on manage items buttons.
5. In the add type field type a name to add a type.
6. type another name to add a second type.
7. Crash.

### Minimal reproduction project

[ThemeVariationCrash.zip](https://github.com/godotengine/godot/files/10665863/ThemeVariationCrash.zip)

property_selected = p_path;
	property_focusable = p_focusable;
	
	for (const KeyValue<StringName, List<EditorProperty *>> &F : editor_property_map) {
		if (F.key == property_selected) {
			continue;
		}
		for (EditorProperty *E : F.value) {
			if (E->is_selected()) {
				E->deselect();
			}
		}
	}
	emit_signal(SNAME("property_selected"), p_path);
}
void EditorInspector::_object_id_selected(const String &p_path, ObjectID p_id) {