Hello, Andres. I apologize for the direct ping, but I think your snapshot scalability work in PG14 could be related to the issue.
The TransactionIdRetreatedBy implementation looks correct... But with txid_current=212195 I see errors like "could not access status of transaction 58643736"... So, maybe vacuum_defer_cleanup_age just highlights some special case (something with "previous" xids on the left side of zero?).... Thanks, Michail.
