medicals have already expired or will expire in soon. you'd better to have a look the Delivery Program
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/service-delivery/coronavirus/permanent-residence.html which has the guideline from official how to handle the cases with expired COPR. for the original IME result M1& M3 person will get additional 6 months.
sorry about I try to but fault to find the insert attachment pics, i only have the capture from others sharing ,
for my case I got the PPR directly, there is not the letter with date of new expire, only can know the new expired date when you got your new COPR with passport. that is why I said some of the person got the new extend letter and some person got the re-PPR directly. the letter as below for your reference
please note that we have re-issued the visa and confirmation of permanent residence, new visa validity is 2020/10/31. please find attached the new passport submission letter providing you 90 days to comply. please note that the previous visas and confirmation of permanent residence are not valid.
from the HK office.