On Linux keyboard focus remains on owner window after calling ShowDialog

Describe the bug

If I call ShowDialog, keyboard focus remains on the owner window.

Steps to reproduce the behavior:

Create a new standard Avalonia project targeting Desktop
On the MainWindow that is supplied with Avalonia project template add a couple of input controls like textbox or checkbox.
Add a button that should open a new dialog and add a click event.
Add a new Avalonia Window (lets call it DialogWindow) and place some input controls on it like textbox or checkbox.
On MainWindow click event that you added call await new DialogWindow().ShowDialog(this);
Once the application starts position your focus in first input control of MainWindow just so it has focus.
Now click the button that opens up a dialog.
Now try to use tab to cycle through controls and observer how the focus remains on MainWindow when it should be in the DialogWindow.

Once a new Window is opened as a dialog it should have the keyboard focus.