Text-only group MMS appear to send but never arrive

[ttshaw1]

Checklist

• I can reproduce the bug with the latest version given here.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected app version

1.0.1

Affected Android/Custom ROM version

Android 11

Affected device model

Asus Zenfone 6

How did you install the app?

F-Droid / IzzyOnDroid

Steps to reproduce the bug

1. "Send group messages as MMS"
2. Open an existing group text conversation or create a new one
3. Write a message containing some text
4. Hit the Send arrow to send an MMS message

Expected behavior

Messages should show that the message is sent, and the people in the group chat should all receive the MMS

Actual behavior

Messages briefly shows that the message is "Sending...", then Sent as indicated by two overlapping checkmarks. But no one in the group receives the message, observed in two different group chats containing two other and three other people.

Screenshots/Screen recordings

Additional information

This is the same problem reported here but it looks like this guy didn't create an issue. Similar to this issue but I don't get an error message and the message looks like it went through.

I'm pretty sure when I send a picture in a group chat the message goes through fine, so it's strictly a text-only MMS problem. This is hard to troubleshoot since I don't want to send my friends inane messages, so I can offer up my phone number if we need to set up a throwaway group chat to debug.

[ttshaw1]

Commit 99cea60 mentions this issue, tying it to 44c540b in the description. Both commits talk about deleting SMS threads; I assume threads as in processes, not message threads. Should I take that to mean this issue is fixed? It's still open so I'm guessing no.

[Astronox]

I'm experiencing the same issue with my group messages not sending, and I'm on the latest version so it's not fixed. I think there's just a winder issue with how MMS messages are handled:

-There's this issue right now with group messages
-Messages with blocked keywords sometimes make it through when they have an image attached
-Images sometimes will not send unless there's a specific size set on "Resize sent MMS images", I set my to 600KB and they sometimes go through.

I've had to switch back to my default messenger app, which is a shame because I could really use the keyword blocking feature this app has.