ListBox AlwaysSelected issue when selected item is not visible during removal

[jeromemanzano]

Describe the bug

When the ListBox.SelectionMode is set to AlwaysSelected and you attempt to remove the first selected ListBoxItem while it is not visible, the item that gets removed is actually the next ListBoxItem. As a result, the first ListBoxItem stays selected.

To Reproduce

1. Set SelectionMode of ListBox to AlwaysSelected. First ListBoxItem should be selected when the app is running.
2. Scroll to the bottom of ListBox (so first ListBoxItem is not visible)
3. Remove first ListBoxItem
4. Scroll back to the top of ListBox
5. It will show that it's the second ListBoxItem that was removed instead of first, and first ListBoxItem is still selected.

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Expected behavior

When first ListBoxItem is removed, it should be removed in the ListBox, and the second ListBoxItem should be the new SelectedItem

Avalonia version

11.0.11

OS

macOS

Additional context

You can find the test code here