I was hoping the Android Pie update would fix this problem, but STILL not fixed. I've checked in the Wear OS app that Message+ is in the Notifications list, and is switched on, but NO text messages are getting sent to my Android Wear device -- in this case a Huawei Watch.
If it weren't for the Auto-Replies for Driving feature, I'd go back to the Samsung Messages app, which works fine with my watch.
Come on VZW -- this is ridiculous. Please fix!