Posting this here because found it while noodling around, the regulations about a COPR lost prior to landing (or with minor errors):
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/permanent-residence/card/program-administration.html#s10
"
POE – PR reports lost CoPR form
If a PR reports that their CoPR has been lost, stolen or destroyed, officers may reprint it from GCMS without referring to the responsible visa office where no misrepresentation is apparent. The CoPR may also be reprinted to correct minor errors, which must be documented in GCMS. Officers at the port of entry are then responsible for taking a new photograph of the client subject to the requirements."
These are the IRCC operational bulletins/manuals.
So yes, confirmed: if there is any problem with your COPR for your arrival at a port of landing, it CAN be printed direct by CBSA at the port of entry, from GCMS. Minor errors can be corrected at that time.
Should anyone care to ask, yes, I am quite confident errors in eye colour or height can be corrected at that time, i.e. no need to freak out if those are in error on the COPR. I am not at all confident the CBSA officers at POE would think this important enough to correct, though.