Well, you cannot apply for a work permit without renouncing your PR. And you DO NOT want to renounce your PR (unless you really don't care about being a Canadian PR, then sure, renounce it).
I know it seems scary, but there's no reason to be scared. The rules are very clear - you can read them here -
https://www.canada.ca/en/immigratio...-immigrants/pr-card/understand-pr-status.html
In a nutshell, a PR who does not meet his RO (that's you), is supposed to be stopped at the border and CBSA can then either let you in without an issue, or begin the process of revoking your PR. If they did not begin that process (which they didn't), and you were allowed in, you are immediately in status and do not need to worry about anything except staying in Canada for 2 whole years to meet your RO.
As a PR, you have all the rights of any permanent resident of Canada. You can live and work freely anywhere in the country. You qualify for healthcare as well.
PR status is NOT dependent on the card expiring. You are a PR unless a competent authority revokes your status. In your case, there is no cause to revoke your status (unless you do something stupid like getting arrested for a serious crime, DUI, etc).
Don't worry about what someone tells your about other people who didn't get a card. You have no idea whether that's true, and even if it is, the circumstances may be very different (maybe that person had a criminal record). The law is clear and you are a PR.