I've been having two issues with Google Now Reminders on my Huawei Watch . First, the reminders are appearing on the phone an hour early. The second issue is that I cannot mark reminders done or snooze them. I think both of these issues are due to the fact that I've been running the beta of the Google app on my Nexus 6P so I have installed the beta. Unfortunately, it looks like the home screens on the Nexus 6P have been reset, so I will have to reconfigure them, but first I am going to reboot the phone.

Reboot didn't make a difference, and unfortunately the reminders are still messed up. 

Based on a review of the Android Wear user forum, this appears to be a common problem that has been appearing for several months. It's amazing that this problem has persisted so long given that Reminders is a key function of Android Wear and Google Now.