An update to WearOS released around mid-March has fixed the root cause for this issue, and Facer 5.1.8 is currently available in beta to close this issue once and for all. If you are still having issues with the step counter, please:
- make sure you are running WearOS 2.23 or newer
- get the Facer 5.1.8 version in beta and validate that steps work
Facer 5.1.8 is scheduled for worldwide release later this week if you'd rather wait a bit.