OF 3.10.2 Monitor/archiving not getting any MessageID values in ofMessageArchive table

Using OpenFire 3.10.2 with the Monitoring plugin to get archiving. Messages are being stored in the ofMessageArchive table, but the messageID field is always null. Why is that?

The conversationID, fromJID, toJID, sentDate, body fields are all populated. But from JIDResource, toJIDResource, messageID, stanza are all null.

Any thoughts on this? Thanks Scott