I saw an article that indicated that CBP has extended the renewal grace period period up to 24 months due to the backlog of interviews. This is confirmed on the CBP website. It states:
You become eligible to renew your membership one year prior to program expiration. If you submit a renewal application before your membership expires, you will be able to continue to use benefits up to 24 months after your membership expiration date, if your renewal does not get processed in time.
Quote above is from here:
https://www.cbp.gov/travel/trusted-traveler-programs/global-entry/frequently-asked-questions
More info here:
https://thepointsguy.com/guide/things-to-know-global-entry/