IsOpen called multiple time when splitting windows

I am using version v18.1.0673

When selecting New Vertical Tab Group my IsOpen is called multiple times:

Closed

Open

Closed

Open

This happens so fast my async network calls to subscribe and unsubscribe to data updates execute before each previous event finishes.  Since I have a network app, I can't block.  If there was only once close and one open I would be find but I am getting multiple which totally hoses me.  Here is my xaml:

<Style x:Key="DockingWindowStyle" TargetType="docking:DockingWindow">
<Setter Property="Description" Value="{Binding Path=Description, Mode=TwoWay}" />
<Setter Property="IsActive" Value="{Binding Path=IsActive, Mode=TwoWay}" />
<Setter Property="IsFloating" Value="{Binding Path=IsFloating, Mode=TwoWay}" />
<Setter Property="IsOpen" Value="{Binding Path=IsOpen, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding Path=IsSelected, Mode=TwoWay}" />
<Setter Property="SerializationId" Value="{Binding Path=SerializationId, Mode=TwoWay}" />
<Setter Property="Title" Value="{Binding Path=Title, Mode=TwoWay}" />
<Setter Property="WindowGroupName" Value="{Binding Path=WindowGroupName, Mode=TwoWay}" />
</Style>

Ideally,  close and open wouldn't even be called or if they were additional data would be available so I could detect the windows is just being moved allowing me to totally ignore the update.  Is there a work around for these multiple calls or does the latest version of the software fix this bug.  I call it a bug because the window is only closed once yet I get two callbacks.  Same goes for open.