Unfortunately logic and common sense don’t exist with IRCC.No idea, just as I have no idea why CEC applicants with 2020 AOR got backlogged endlessly. Must be a mandate but dunno if it's issued inside + by IRCC or from Canadian govt.
Guess the logic works that way:
if class == CEC && AOR > 20201231 && CoR == Canada:
process_at_full_speed()
else:
put_in_backlog()