SelectableTextBlock does not work properly when TextAlignment is not Left

[kuiperzone]

Describe the bug

SelectableTextBlock does not work properly when TextAlignment is not Left. Certain portions cannot be selected.

I'm on Linux, but suspect it might apply to other platforms.

See the video.

Screencast.from.2024-10-11.05-11-08.webm

To Reproduce

private static SelectableTextBlock GetTextBlock(TextAlignment align)
{
    var text = new SelectableTextBlock();
    text.TextAlignment = align;
    text.Inlines!.Add( new Run("H-Center") );
    text.Inlines.Add( new LineBreak() );
    text.Inlines.Add( new Run("V-Middle") );
    text.Inlines.Add( new LineBreak() );
    text.Inlines.Add( new Run("Larger") );

    return text;
}

Expected behavior

No response

Avalonia version

11.1.3

OS

Linux

Additional context

No response