I want to pull the black squares from the red ring. I succeed, but in a strange way, I think.
First, I group the squares and make sure they protrude across the red circle. I first mark the grouped squares then the red circle, then I press Boolean Subtract but get a “wrong” result.
When I press Undo and then again on Boolean Subtract - I get the desired result.
It was a coincidence I found the “solution” to my little problem, - My question is: Can it be done without the Undo button “stopover”