Canvas's regrading is a hot mess in so many ways. This is just one more. I found this thread like everyone else, after realizing that I'd left the "1 point" default on a quiz question and trying to change it to the intended 4 points, then realizing that there was no regrade option for that. Screaming into the void.
If it is one of the very very few question types that Canvas will regrade at all, I discovered that you can change the point value, then change the answer it to a wrong answer, select regrade, save, edit again to change the answer back to the correct answer, select regrade, save again, and it will regrade the question with the corrected point value. BUT... it won't update the grades. So then you have to go into speedgrader and click "update grade" manually for every single student. Another long, clunky, ridiculous work-around for something that shouldn't require one, but it does at least keep you from having to read and evaluate each student's answer and manually scoring them, risking further errors.
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