Pebble Time 2 - HR Zones Bar shows no heart-rate zone percentages/attributions

Hello :slight_smile:

First time Pebble user here with a week of use on the PT2.

All working well with health tracking so far, apart from the zones being attributed as seen in the heart rate card screenshot in the docs i.e. I have the HR graph and also see HR in watchfaces, but 0% for Z1, Z2 and Z3. I have set my personal data settings via the Pebble App (Android, Graphene OS), as I saw this in another thread mentioned as cause. Any other ideas what might be needed or is this potentially a bug?

Just to answer my own question partly, as I have now tested more thoroughly whilst swimming:
It seems I did not vigorously enough exercise before to enter the zones. However there is still some disconnect with the Z1-Z3, as it says that there are “… five zones loosely correspond to: warm-up, fat-burn, cardio, threshold, and peak.” How has this translated to the three zones that are shown in the graph?