Only update active installed package if invalid

StabilityMatrix.Avalonia/ViewModels/LaunchPageViewModel.cs

@@ -180,7 +180,14 @@ public partial class LaunchPageViewModel : PageViewModelBase, IDisposable, IAsyn
 
     public override void OnLoaded()
     {
+        // Load installed packages
+        InstalledPackages = new ObservableCollection<InstalledPackage>(
+            settingsManager.Settings.InstalledPackages
+        );
+
         // Ensure active package either exists or is null
+        if (SelectedPackage?.Id is { } id && InstalledPackages.All(x => x.Id != id))
+        {
             settingsManager.Transaction(
                 s =>
                 {
@@ -188,11 +195,7 @@ public partial class LaunchPageViewModel : PageViewModelBase, IDisposable, IAsyn
                 },
                 ignoreMissingLibraryDir: true
             );
-
-        // Load installed packages
-        InstalledPackages = new ObservableCollection<InstalledPackage>(
-            settingsManager.Settings.InstalledPackages
-        );
+        }
 
         // Load active package
         SelectedPackage = settingsManager.Settings.ActiveInstalledPackage;