@mff73 both activities have HR data, as well as GPS track, duration, pace, etc.
However, the first activity (the one that crashed) does not have TSS, calories, or steps recorded.
I’ve also noticed another quirk with joining the activities together… in the merged file, the second part of the run has been added as manual laps, not auto laps. This is fine in Suunto App (although looks odd) as it still has the correct total distance.
When I add it to Strava however, it shows the correct duration, correct GPS track, but it ignores the distance of the second activity.