Open Radar

 
Summary:
I have a group message with my family (6 people total). It's named "Family". However, even though members of the family all send messages only on that thread, it will frequently split into an unnamed, separate thread with all 6 family members. The split won't happen for all family members at the same time (e.g. it'll split on my phone but not my brother's, and later it will split on my brother's phone but not mine).

My phone is currently on iOS 9 beta 4, but this was happening when it was on iOS 8 as well. The rest of my family members are mostly on iOS 8, and one or two of them is on iOS 7. We're all on Verizon.

Steps to Reproduce:
I'm not sure. It happens randomly, but it happens daily without fail.

Expected Results:
I expect messages sent to a named group thread to always stay on that thread and never split up into a separate thread.

Actual Results:
The messages split into separate threads

Version:
iOS 9 beta 4, iOS 8, iOS 7

Notes:


Configuration:
iPhone 6 64GB, Verizon