Messages synced from messenger groups, but matrix messages not synced back

[smartin015]

Hey - thanks for helping my friend group break the shackles of FB messenger :)

I wanted to report some unexpected behavior that's been persisting for several weeks now. I'm self-hosting matrix/element and using mautrix-facebook, along with several other bridges. Encryption is enabled (allow: true and was also set to default: true; I've since turned the default off)

For mautrix-facebook, I can send and receive direct messages with no problem. Group messages by other FB users are also synced back to matrix. When I attempt to send a message from matrix to the FB group, matrix accepts the message but it never appears on the FB group itself (when viewed from the Messenger app). This has changed from previously when I was able to sync messages out.

Put differently: DMs work both directions, but group chats are currently read-only.

I've got mau debug logs, paho info logs, and aiohttp info logs. I grepped through the logfile and filtered by two of the group chat matrix room IDs, but didn't see any warnings or errors: https://pastebin.com/q1yA407h (note: domain & user names redacted)

So I had a few questions I'd appreciate some help with:

• Has this happened in the past / is it happening for anyone now? I saw Only getting messages and not able to send messages #208, but I'm not seeing any of those errors.
• What can I do that would give you more information for debugging?
• Are there settings I could try or actions I could take to "unstick" these groups?

Thanks!