it looks like switching off ‘Include in Auto-Contribute’ doesn’t work anymore in Beta (0.61.36) and Dev (0.62.8). In Brave standard (0.60.45) it still works fine.
I tried it more than 20 times at Beta and Dev with several different websites. Clicked both at the slider and the purple button. But it never worked correctly.
I am rather sure that it worked fine a couple of days ago.