I've noticed that I've been doing workouts which should be recording intensity minutes, but don't. And I've had other far less strenuous workouts that have given me intensity minutes. For example, yesterday I did a fast 3km workout along with warm-up and cool-down segments which registered in Zone 4 territory mostly, but no intensity minutes were recorded. See screenshot below for your reference:
An example of an less impacting activity which ended up giving intensity minutes nevertheless would be the following cardio (Crossfit) session:
The zone-by-zone breakdown for this session looked like this:
How can this be? Has anyone else had this problem or noticed this discrepancy? Does anyone know what the cause is?