### 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)

label = EditorPropertyNameProcessor::get_singleton()->translate_group_name(component);
						tooltip = component;
					} else {
						label = component;
						tooltip = EditorPropertyNameProcessor::get_singleton()->translate_group_name(component);
					}
				} else {
					label = EditorPropertyNameProcessor::get_singleton()->process_name(component, section_name_style);
					tooltip = EditorPropertyNameProcessor::get_singleton()->process_name(component, EditorPropertyNameProcessor::get_tooltip_style(section_name_style));
				}
				Color c = sscolor;
				c.a /= level;
				section->setup(acc_path, label, object, c, use_folding, section_depth);
				section->set_tooltip_text(tooltip);
				
				for (Ref<EditorInspectorPlugin> &ped : valid_plugins) {
					ped->parse_group(object, path);
					_parse_added_editors(section->get_vbox(), section, ped);
				}
				vbox_per_path[root_vbox][acc_path] = section->get_vbox();
			}
			current_vbox = vbox_per_path[root_vbox][acc_path];
			level = (MIN(level + 1, 4));
		}
		
		if (current_vbox == main_vbox) {
			current_vbox = category_vbox;
		}
		
		if (p.usage & PROPERTY_USAGE_ARRAY) {