Group text dysfonctional - does not reach most contacts

[maee-r]

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

1.6.0

Affected Android/Custom ROM version

Android 15 AP3A. 240905.015.A2

Affected device model

Xiaomi HyperOS Redmi 15C

How did you install the app?

F-Droid / IzzyOnDroid

Steps to reproduce the bug

1. Create contacts named A, B and C with different phone number each.
2. Create a new group named 'Test'
3. add A B and C to this group. Alternatively, modify each contact, then add them individually to the group 'Test' .
4. Go to groups, select 'Test', then send a group text by clicking on the top right icon. Write a simple message like 'can you receive this' then send.

Expected behavior

Phone Users A, B and C should all receive a text that says 'can you receive this'.

Actual behavior

A receives the text, but B and C receive none.

After sending more group texts and creating another group, results are the same : A is receiving, not B and C.
When I open my Fossify message app, the group message I sent appears with a double check, as if delivered to the group contacts (listed on the top bar).

Screenshots/Screen recordings

No response

Additional information

No response