I’m running into the same issue, did you find any workaround?
It also seems to be like the old ReplicateSubobjects(UActorChannel* Channel, FOutBunch* Bunch, FReplicationFlags* RepFlags) method is no longer being called so the approach that worked for replicating TArrays in UE4 is no longer working. This seems like a pretty big loss in functionality with the new approach to replicating subobjects.