I understand that if your TRV and TWP expire, then you have to apply a new TWP but TRV is optional because you need a TRV only if you go outside Canada and re-enter. In this case, if you apply for PR and send your PP for stamping to visa office, they will see that you have the required TWPs but maybe your TRV expired much earlier. Will that be an issue? I believe the immigration officers should have a good understanding of CIC rules but they might specialize in different areas. So a PR officer may or may not have enough information regarding the TRVs (depending on their experience).