bugifx: correct display of document tree item invariant name

src/Umbraco.Web.UI.Client/src/packages/documents/documents/tree/tree-item/document-tree-item.element.ts

@@ -45,8 +45,17 @@ export class UmbDocumentTreeItemElement extends UmbTreeItemElementBase<UmbDocume
 		return this.item?.variants.find((x) => x.culture === culture);
 	}
 
+	#isInvariant() {
+		const firstVariant = this.item?.variants[0];
+		return firstVariant?.culture === null && firstVariant?.segment === null;
+	}
+
 	// TODO: we should move the fallback name logic to a helper class. It will be used in multiple places
 	#getLabel() {
+		if (this.#isInvariant()) {
+			return this._item?.variants[0].name;
+		}
+
 		const fallbackName = this.#getVariant(this._defaultCulture)?.name ?? this._item?.variants[0].name ?? 'Unknown';
 		return this._variant?.name ?? `(${fallbackName})`;
 	}