I too had this same issue and ultimately found it to be NOT a problem with anything related to the vehicle, settings, or audio system.
A side note, mine and my wife's phones are Android so I don't have anyway to confirm this anything other than an Android based phone.
It WAS/IS a "feature" of my phone where you can change SMS settings (chat) from simple SMS to more robust features like MMS.
Once I found them and experimented toggling settings,, I finally got it working back to normal!
Before:
time;date;time zone adjust;subject; to phone #; cc phone number; MESSAGE
After:
MESSAGE
I also clued into it being the phone because my wife has a CRV and in her vehicle her SMS messages are normal.
Her phone in CRV, messages normal
Her phone in PP, messages normal.
My phone in PP, abnormal.
My phone in CRV, abnormal.
Fiddled with the chat/messaging settings,, all normal now!
Hope this helps someone in the future!