Apple TV clock drift

Currently my FIT files created by Zwift/Apple TV seem to be suffering from clock drift. The clock seems to run fast in comparison to my secondary and tertiary device recordings (on Garmin Edge computers.)

You can see, for example, in this ZwiftPower analysis…
zwiftpower. com/analysis.php?set_id=176408

In the duration of 76m45s, the two Garmins stayed perfectly in sync while the Zwift data is 6-7 seconds off by the end. This is something I’ve experienced in the past, it seemed to go away for a while, and now is back with a vengeance.

Is it a Zwift bug or a tvOS bug?

No one else?