I have a similar issue with marking Incompletes in IC. We were asked to mark assignments Incomplete during our remote learning due to COVID-19. There is no way to do that in Canvas, so I just go to my IC and any blanks after a due date, I will manually enter the I for incomplete and flag it. But when a student does the work in Canvas, and I grade it, and the passback occurs between IC and Canvas, the new grade will go in, but the Incomplete flag is still there...it does not get removed.
I have been manually going through and removing the flags each day....kind of frustrating. Any ideas?