add flag to test if packages have been loaded once (is there a better way?)

src/Umbraco.Web.UI.Client/src/backoffice/packages/repository/package.repository.ts

@@ -30,6 +30,10 @@ export class UmbPackageRepository {
 	 * @private
 	 */
 	async #requestRootItems(store: UmbPackageStore) {
+		if (store.isPackagesLoaded) {
+			return;
+		}
+
 		const { data } = await this.#packageSource.getRootItems();
 
 		if (data) {

src/Umbraco.Web.UI.Client/src/backoffice/packages/repository/package.store.ts

@@ -26,6 +26,8 @@ export class UmbPackageStore extends UmbStoreBase {
 
 	extensions = this.#extensions.asObservable();
 
+	isPackagesLoaded = false;
+
 	/**
 	 * Creates an instance of PackageStore.
 	 * @param {UmbControllerHostInterface} host
@@ -40,6 +42,7 @@ export class UmbPackageStore extends UmbStoreBase {
 	 */
 	appendItems(packages: Array<UmbPackage>) {
 		this.#packages.next(packages);
+		this.isPackagesLoaded = true;
 	}
 
 	appendExtensions(extensions: ManifestBase[]) {