@BGDev I'm not certain you're encountering a bug or a network issue (or something else).
Given that you have a working production workload on ESXi and a Production XCP-ng environment, what I personally would suggest is to replication the data from the old to the new, schedule a final cut over day and perform a final replication.
If this was a database drive or something that help system files then I'd dig further into why its not exporting successfully, but since it seems like its just a file share, replicating the individual files would be the simplest approach.