Since the latest system update stress levels are no longer properly displayed on the watch. It still syncs correctly with the app as far as I can tell, but it will eratically erase all data on the watch itself... For instance, I just applied the latest hotfix and it seemed to work after the watch had restarted... after checking my heart rate over the day, and then going back to stress level again all data for the entire day were gone once again...
In the overview tab it still shows for many hours I had low/medium/high stress or were in resting state, but all the graphs are gone. Only stress levels are affected, all other data screens work just fine... Restarting the watch does nothing (apart from the one time mere minutes ago after applying the aforementioned hotfix following the last major update to 13.17).