I see, so the form was for spousal access to your records, not because you were using an immigration consultant. In that case, there’s likely a chance that this will not cause a huge delay in processing, maybe a few days for the IRCC to process the new documentation. Hopefully someone who’s had a similar experience to you previously, can offer some advice. This particular topic is somewhat new to me.
I did, however, have an entry to Canada through an airport, where the CBSA didn’t stamp my passport. I enclosed a letter with all the other entry stamps I sent as part of my OWP application advising the date, time, and flight number I arrived on. This was from 2013, so because it wasn’t to prove my current status, they either didn’t care about the stamp being missing, or they verified my claim with the CBSA.
If you’re being asked to prove you have valid current status, it’s probably only due to the requirement that for an OWP to approved, you need valid status. Once IRCC has that confirmed, barring any other issues, the OWP should be issued. Hopefully, this won’t delay the processing. You could try calling the call centre and asking them to confirm receipt and if it’s been processed. They may be able to help.