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Inconsistency between 965 HR data and Edge1040 activity using 965 HR via broadcast

Hello,

This morning I used my Edge 1040 to go to work with the 965 brodcasting HR data like I usually do.
I noticed the watch recorded a higher max value than the one in the Edge 1040 activity.
Where does this comes from?

The data was wrong on the watch on those periods:
8h14-8h16: 143bpm (ok)
8h16-8h18: 170bpm (too high)
8h18-8h20: 176bpm (too high)
8h20-8h22: 175bpm (too high)
8h22-8h24: 174bpm (too high)
8h24-8h26: 166bpm (too high)
8h26-8h28: 121bpm (ok)

This looks like a bug:

Here the data from the watch (Max=176bpm) : https://prnt.sc/Zxr3ABfAg29N 
Here the data from the activity (Max=150bpm): https://prnt.sc/T3V9Clv4CnD4

I am using Edge 1040 with firmware 21.17 and 965 with firmware 19.18.

It is not the first time I noticed this behavior. Is this a known issue ?

Thanks for the support,
BR