Since last watchOS update (10.1) the clock on the upper right corner is missing. Please compare this photo with a screenshot from Strava's Apple Watch FAQ page:

I tried switching the watch language to English to be sure it was not a language specific problem and that's not the case. Is this a known bug? Any suggestions to fix? It is very annoying using the Strava app on commuting by bike (so I am not worried about sports stats etc., just want to log the activity) and having to go back home to see the current time.

