Wait/Notify is not working correctly after some time

[#1]

Hello community,

I have currently every ~5 days the problem that FlowFiles from the Wait Processor are not get released, only after the "Expiration Duration" was reached (and then routed to the expired relationship). The DistributedMapCacheClientService/DistributedMapCacheServer is used and the problem was prevalent in 1.17/1.20/1.21.

After restarting Nifi everything is working fine again with new arrived flowfiles, except that the old flowfiles are still hanging in the wait relationship.

Has anyone also experienced the same problem or know what the problem could be?

Thank you!