Einhugur WindowSplitter or TreeView background not refreshing

I have a window with a TreeView and a WindowSplitter from Einhugur. When I more the splitter to the left side, the background are not refreshed.

Sub Open() Handles Open
me.AddControl tvWhiskey,true
End Sub

If I add these Event, it works good.
Sub SplitterMoved(X as Integer, Y as Integer) Handles SplitterMoved
End Sub

Tested with:
macOS 10.14.6
Xojo 2019 R2.1
Einhugur Plugins:
WindowSplitter 9.4.2
TreeView 7.7.4

It appears from what you say that Xojo no longer auto invalidates the parent when the child is moved.