### 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)

F = dd->class_list.find(F->value.inherits);
					} else {
						break;
					}
				}
				doc_info_cache[classname][propname] = doc_info;
			}
		}
		Vector<EditorInspectorPlugin::AddedEditor> editors;
		Vector<EditorInspectorPlugin::AddedEditor> late_editors;
		
		for (Ref<EditorInspectorPlugin> &ped : valid_plugins) {
			bool exclusive = ped->parse_property(object, p.type, p.name, p.hint, p.hint_string, p.usage, wide_editors);
			for (const EditorInspectorPlugin::AddedEditor &F : ped->added_editors) {
				if (F.add_to_end) {
					late_editors.push_back(F);
				} else {
					editors.push_back(F);
				}
			}
			ped->added_editors.clear();
			if (exclusive) {
				break;
			}
		}
		editors.append_array(late_editors);
		for (int i = 0; i < editors.size(); i++) {
			EditorProperty *ep = Object::cast_to<EditorProperty>(editors[i].property_editor);
			const Vector<String> &properties = editors[i].properties;
			if (ep) {