Hope it's because they are preparing to shift the processing capacity to finalize outland applications, although I think it is extremely unlikely.
When I looked into the internal doc which contains info about the grouping of overseas applications into A, B and C, it clearly says they are gonna start finalizing applications when COPR/PRV holders are exempt from travel ban. But we haven't seen any significant movement after the COPR travel ban was cancelled in June. It's been a while now. Some say when travel restrictions are removed for tourists, IRCC will move as well. Now I wonder if they will use vaccination as an excuse, as the planned September reopening is only for vaccinated travelers.