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heart rate zones with software 8.20

Dear All,

Do you have any bugs in heart rate zones instogram with new software 8.20 ?
The issue is already visible on the device whey the task is over.   The same issue on Garmin connect Web/app/pc suite.
My task is long about 8 hour, with several times in zone 3 4 and 5.  But in the heart rate zone there is a mistake.

Do you have any idea?

thanks