Adding a color property to a clip in the AW sets the color property key properly, but also generates an error...

"ArgumentException: Getting control 17's position in a group with only 17 controls when doing ExecuteCommand"

repro is very simple:
Create a Cube
Select it and open the AW
Click the Create button in the AW to create a clip
In the Inspector, scroll and expand the Material component...
and click the material color property to pop the color picker...
click a color in the color picker... color is changed, key is add, and error is generated.
see attached gif