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Reply to Apple Watch HKWorkoutSession does not collect the health data sometimes
I believe the metrics that are enabled automatically depend on the activity type and location. At least that is the case for distance. I'm not sure what the HR issue is, assuming this is a watch workout. But maybe it's an apple health permission issue. Also, check if Power Saving mode is on. That limits heart rate monitoring. Open the watch app on your phone, tap on General and see if Workout Power Saving Mode is turned on. If so, turn it off.
Jul ’20