IME candidate window won't follow the cursor after `new window()`

[theoractice]

Describe the bug

In the screenshot new Window() is called in background (created but not shown) after 5 seconds, then the IME candidate window just won't follow the cursor.
If you switch to other windows and switch back, the candidate window starts moving again:

However for situations where the main window must always have focus, This is unacceptable.

To Reproduce

Simply create a window via

        Window window = null!;
        private async void Window_Loaded(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
        {
            await Task.Delay(5000);
            Dispatcher.UIThread.Post(() =>
            {
                window = new Window();
            });
        }

Then after 5 seconds, IME candidate window will not move at all as you type.

Expected behavior

IME candidate window should behave as normal.

Avalonia version

11.3.x and 12.0.0-rc1

OS

Windows

Additional context

MRE
AvaloniaApplication1.zip