Updating the cache element and not an unlinked reference to it. (#19057)

src/sql/workbench/contrib/executionPlan/browser/executionPlanTab.ts

@@ -84,6 +84,7 @@ export class ExecutionPlanTabView implements IPanelView {
 			currentView.onHide(this._container);
 			this._input.graphs = [];
 			currentView = this._instantiationService.createInstance(ExecutionPlanFileView);
+			this._viewCache.executionPlanFileViewMap.set(this._input.executionPlanFileViewUUID, currentView);
 			currentView.render(this._container);
 		}
 	}