I’ve not heard of that bug before. The biggest issue I have with the text message integration is that it and calendar sync have gotten out of sync or disabled a few times, and I’ve had to renewable those features.
as for your issue, I’d try the standard “did you try turning it off and on?” solution to IT issues, This would be rebooting the phone, resetting the car, double-press on the steering wheel buttons, disable and then enable text message syncing, unpair the phone from the car and then unpair the car from the phone and finally starting the Bluetooth pairing process over. Some combination of those rest procedures should help.