New MMS group created for responses to an existing group.

[cdysthe]

I have:

• searched open and closed issues for duplicates
• read https://github.com/signalapp/Signal-Android/wiki/Submitting-useful-bug-reports

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Bug description

Replies to an existing MMS group creates a new MMS group with "Me" added.

Steps to reproduce

• Create a MMS group. Send a message to the group.
• When someone answers the group message a new MMS group is created with 'Me' as a new member. So if the group I created contains members A,B,C the new group containing the answers will have Me,A,B,C as members

Actual result: If the group I created contains members A,B,C the new group containing the answers will have Me,A,B,C as members
Expected result: The answers to the group will come in the initial group created with members A,B,C

Screenshots

Device info

Device: Moto G5+
Android version: 7.0.0
Signal version: 4.17.5 (Beta)

Link to debug log

https://debuglogs.org/2526a8ae758fed3031f850dd6bd698b8ea42c1e79bd08a78bba957c5e800b7be

[FeuRenard]

Duplicate of #7161