MakePen Object Mapper chip bug or not?
Solution 1:
This behavior has been there for a long time, and I believe it to be intentional. (Although we can never be sure, since there is no official documentation whatsoever.) When you are holding the maker pen, your off-hand behaves similar to the move tool, meaning that the object will snap, align and create an undo-actions.
So you will have to drop the maker pen to test the object mapper chip. That should not be too much of a problem though if you add some output chips and set the option in the palette settings to always see gadgets.