Please do not travel until you can get a confirmation from IRCC or Airlines regarding sameI'm exactly in the same situation. Authorization letter issued by Ottawa on October 1, 2020.From my GCKey account previously issued CoPR/PRV numbers got removed. Status changed from Approved to Submitted. in AL, new CoPR/PRV document numbers and extended validity dates are mentioned. No reply to my webforms or email from IRCC. Since Oct 1, 2020 I'm waiting. AL is valid till Dec 2, 2020 and I wish to travel within next 2 weeks. I'm worried that airlines won't allow boarding since my extension dates and new document numbers are not yet updated (electronically) in IRCC system
Apart from a financial and time loss, It's mentally very disturbing. Since I was with my family(small kids) it was also physically, really exhausting for all.