If you check the tracking sheet you can see that Ottawa has only done one batch of ppr on dec 31. Zero after that (unless they were in Canada and applied outland) from what I have seen
I think that there was a big amount of ppr's at the end of the year to try and increase the number processed for the 2020 year to try and reach the government's goal of X of apps processed. I think you won't see them being done in batches like that again but I could be wrong.