Description from https://access.redhat.com/documentation/en-us/red_hat_amq/7.5/html-single/configuring_amq_broker/index#replication_elements

max-saved-replicated-journals-size

Applies to slave brokers only. Specifies how many times a slave broker can restart after moving its files on start. Once there are this number of slave journal files the broker will stop permanently after if fails back. The default is 2.

The observed behaviour in test; once the number of oldreplica folders exceed the "max-saved-replicated-journals-size”, the slave broker deletes the older oldreplica folders rather than "stop" the slave broker startup.