I’ve observed similar errors with the 8.4p2 patch deployment. - {note: I don’t have any data apart from spadmin, that strongly supports your statement believe it’s not because of some rule/script not using decache/flush iterator}
Please note that all these issues are happening in a special case where we are using PostgreSQL 15 as the database.
Reference tickets for your information:
Conclusion: Given the sufficient evidence, the next step is to raise a support ticket with SailPoint .