Now you scared me. My nomination was issued in 2022/Oct/13 and it will expire in 2023/Jul/13.
AR: 2022/Oct/26
it shouldn't be an issue- the nomination certificate expiration is meant to be the date at which you have to applied for PR for it to be valid. The case mentioned earlier looks like a situation where a newly hired IRCC officer has a misunderstanding of the rules (which in itself is extremely worrying).
I know that they were on a hiring spree for IRCC to try and speed up the processing of cases- but you have to hope they haven't skimped on training.