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Wrong heart rate measurement after updating to 16.60

Hi team

A strange problem came to my attention this week , after 16.60 update.

It seems that I get wrong measurement of heart rate when I am in calm condition.

I noticed first this Friday when I had two things on the same day 

a)Update to 16.60

b) Astra Zeneca vaccine.

Initially I thought that it was the vaccine that created the issue but after examining with another watch I had even 20beats per second differences.  I had 58 on garmin athlete and 78 on Apple Watch. When heart rate is over 90 , both watches have the same reading.

The strange thing is that the connect and apple health has the same average result without the low reading appeared on live.