doesn't recover once basebackup_delta_mode_max is reached

[jelmer]

What happened?

taking base backups failed for quite a long time (many hours), resulting in the retry count for the backup site to be reached.

even once the circumstances changed (likely allowing backups again), base backups aren't resumed.

What did you expect to happen?

I'd expect rate-limiting of the number of retries (as happened), but that attempts to take a base backup still continue.