Watch reboot when adding data field on a map screen for an activity from watch

If I go to an activity configuration which has a map screen, then go to map screen settings, add a new data field on top of the map and change its content to HeartRate/ %MaxHeartRate the watch reboot. It happens every single time I do the manipulation.

Doing the same configuration from phone works well, and after that changing data field content from the watch works fine too. It's only happening when there are not yet data field on the map