InvalidOperationException when using ContentControl inside DocumentDock

[jurihock]

Steps to reproduce in the DockXamlSample example in this repository:

Modification in view ItemsSourceExample.axaml:

<StackPanel DataContext="{Binding Context}">
  <StackPanel x:DataType="local:MyDocumentModel">
    <!-- insert ContentControl pointing to MyButton -->
    <ContentControl Content="{Binding MyButton}"/>
    <!-- ... -->
  </StackPanel>
</StackPanel>

Modification in view model MyDocumentModel.cs:

public class MyDocumentModel : INotifyPropertyChanged
{
  // insert MyButton as instance of Button (or another control)
  public Button MyButton { get; } = new() { Content = "CLICK ME" };
}

Start DockXamlSample, open "ItemsSource Example", and rearrange docking tabs:

System.InvalidOperationException: 'The control XXX already has a visual parent ContentPresenter (Name = PART_ContentPresenter, Host = ContentControl) while trying to add it as a child of ContentPresenter (Name = PART_ContentPresenter, Host = ContentControl).'

Dock version v12.0.0.2. Was not an issue in previous Dock version 11.

See also:

• Described modifications diff.txt
• Screen recording DockXamlSample.mp4