Client not syncing messages; mod_carboncopy

Question

I've had a prosody running trunk for about a year and haven't had any issues.

I've been testing ejabberd 18.12 and completed a transfer with ejabberdctl import_prosody

on a "migrated" prosody directory with prosody-migrator

Now, carbon copy when messaging others and messaging yourself (bob@domain messaging bob@domain) doesn't seem to work

I'm expecting when I send a message on Conversations, Gajim and Converse.js should also see that sent message. I'm also expecting to see messages I send myself to myself

I've been testing between gajim-nightly, Conversations Beta and converse.js

Conversations reports XEP-0280 Message Carbons are available
Gajim-nightly enable_message_carbons is activated

Ejabberd while running in foreground doesn't give any information.

In ejabberd, mod_carboncopy: {} should be shown as enabled.

Disabling a account and re-enabling (and triggering MAM) causes these messages to show up. Some tests:

bob@domain (Conversations Beta) -> bob@domain:
- shows up on Gajim but not Converse.js (loads with MAM following account disable / enable)
bob@domain (Gajim) -> bob@domain:
- Neither receive, both (Converse, Conversations) load with MAM following account disable / enable
bob@domain (Converse) -> bob@domain:
- Shows up on Gajim but not Conversations (loads with MAM following account disable / enable)
bob@domain (Conversation) -> anotheruser@domain:
- Message received by anotheruser@domain
- Neither Conversations nor Converse see it (MAM load with account disable / enable syncs the message for both)
bob@domain (Converse) -> anotheruser@domain
- Message received by anotheruser@domain
- Neither Conversations nor Gajim see it (MAM load with account disable / enable syncs the message for both)
bob@domain (Gajim) -> anotheruser@domain
- Message received by anotheruser@domain
- Neither Conversations nor Converse see it (MAM load with account disable / enable syncs the message for both)