Fix: Get NavigationParameter from corresponding TabBarItem

Author: seer-by-sentry[bot]

src/Files.App/Views/MainPage.xaml.cs

@@ -139,7 +139,9 @@ public async void MultitaskingControl_CurrentInstanceChanged(object? sender, Cur
 			if (SidebarAdaptiveViewModel.PaneHolder is not null)
 				SidebarAdaptiveViewModel.PaneHolder.PropertyChanged -= PaneHolder_PropertyChanged;
 
-			var navArgs = e.CurrentInstance.TabBarItemParameter?.NavigationParameter;
+			// Find the TabBarItem that contains this ITabBarItemContent instance
+			var correspondingTabItem = ViewModel.AppInstances.FirstOrDefault(tabItem => tabItem.TabItemContent == e.CurrentInstance);
+			var navArgs = correspondingTabItem?.NavigationParameter?.NavigationParameter;
 			if (e.CurrentInstance is IShellPanesPage currentInstance)
 			{
 				SidebarAdaptiveViewModel.PaneHolder = currentInstance;