FObjectReplicator::UpdateUnmappedObjects calls CallRepNotifies, but does not call PostRepNotifies.
Further, the order of CallRepNotifies and PostNetReceive in FObjectReplicator::UpdateUnmappedObjects is not consistent with the order in
FObjectReplicator::PostReceivedBunch.
This can cause inconsistencies during replication.
CL 4554873 and CL 4555062 fixes the missing call to PostRepNotifies and the changes the order of calls to PostNetReceive() and CallRepNotifies() to be consistent with other code paths.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-58822 in the post.