message: fix(Navigation): clone navigation object to prevent mutation of original
diff: @@ -331,7 +331,8 @@ export class TsNavigationComponent implements OnInit, AfterViewInit {
  */
  private setUpInitialArrays(items: TsNavigationItem[]): void {
  // Clone the items and define the external flag for links only
  - const allItems = Array.from(items).map(item => {
  + const allItems = items.map(i => {
  + const item: TsNavigationItem = { ...i };
  if (isLinkItem(item)) {
  item.isExternal = this.isExternalLink(item.destination);
  }
  