When using the distributor the behavior of retries and the related message flow is different between major versions.
Immediate Retries are always performed on the worker.
The behavior of Delayed Retries is different between major versions.
Delayed Retries has two configurable items TimeIncrease and NumberOfRetries.
The message will be retried on any available worker. Message processing is not sticky to the worker.
Due to the behavioral differences between major versions it is advised to have the SecondLevelRetriesConfig exactly the same on both the distributor and the workers even though it could be that settings are ignored.
It is assumed that NumberOfRetries and TimeIncrease are the same on the distributor and the workers.