PURGE BINARY LOGS not working anymore

We upgraded all our MariaDB/Galera clusters last week from 10.11.7 to 11.4.2.

Since then we noticed that the binary logs aren't automaticly purged anymore on many nodes. (Yes, new binlogs are created)

Also on manually calling 'PURGE BINARY LOGS', we don't get any error, but it does nothing.

We don't see any issues on standalone MariaDB nodes, so it might be Galera related.

It looks like the purging does work on Galera member nodes where an async replica is connected.

Relevant settings;

expire_logs_days = 1

log_bin

log_slave_updates