I have multiple answer questions with partial correctness. I want students to be able to see if they got the question right, partially right, or wrong, and I need to give feedback for incorrect answers, since they can try the quiz multiple times. However, if I choose 'Indicate response as correct or incorrect', then each individual tick box is marked as correct or incorrect -- meaning that students can see exactly what the correct and incorrect boxes should be, regardless of what they selected. Conversely, if I only let them see how many points they got (so as to hide the "correctness" of each answer choice), then my feedback for incorrect answers doesn't show up.
I'm pretty sure this didn't used to be the case, but it certainly is now. As always, Canvas seems unable to fathom how formative assessment should actually work. (Do they even have a UX team??)
