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SW 15.19 HR sensor blinks a few times each minute when watch is unworn

Hi,

Just a quirk I noticed since the update,

  • The sensor LEDs blink briefly every few seconds when the watch is not on your wrist.

I'm not sure if this is a bug or not. If it is not a bug what purpose could it serve?

This did not happen with 14.XX softwares on both my 955 and wife's 255S.