How to make sure the detected heartrate comes from HRM pro+ in stead of Fenix 7?

So, I'm aware this topic has come up before but the answers are not very detailed somehow. During a run yesterday I accidentally had an itch under my watch and saw the green lights solid on, which indicates that the HR sensor of the watch is active. My HRM pro+ was connected (went out of activity and checked), but the wrist sensor stayed active upon re-entering the activity. 

Surely there must be a better way than to manually disable the watch HR sensor before starting a run? Does anyone have a clue? 

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