Fundamentals\Shell\Xaminals - Selected ShellItem issue

**Repo**: https://github.com/dotnet/maui-samples/tree/main/8.0/Fundamentals/Shell

**Android/Windows**
When the app starts, the CatPage is shown, which shows collection of cats.
Now when you click on a cat, you navigate to the cats'Detailspage.
Now you navigate back by clicking the back button.
Now click again on the same cat that was previously selected.
Nothing happens.
**Expected**: Seeing the cats'Detailspage again.

**Repro steps:**
Run the app.
Select a cat. (=> View changes to DetailsView).
Navigate back.
Try to select same cat again. => Nothing happens.