According to
DOC, these certificates got another extension:
Marriott has extended free night certificates that were expiring on June 30, 2022 until December 31, 2022. No official announcement has been made, but you should see the new expiration date on your certificates.
I can't imagine how many certificates were burned at local FF or CY in the past week or two just not to 'waste' them, #bonvoyed?