Triple-Tap stopped working on Gear S3

Two days ago, I upgraded my phone from a Droid Turbo to a Galaxy S8+. While the new phone was installing all my apps, I was informed that there were also app updates for my Gear S3 and I allowed them to be applied, too. Ever since I got the watch working with the new phone, I have only been able to change (Facer) watch faces by using the Facer app on the phone. Whenever I try the Triple-Tap that worked so well as recently as two days ago, I’m told that the selected watchface is not themeable.

Is there anything I can do to get this working again?