I have a Fenix 6x and in the current software version (27.00) the skiing activity confuses ski runs and lifts, thus also giving totally nonsense data for speed. Since the lift runs are falsly recognized as ski runs, the speed of riding the lift is also tracked as speed, which in turn falsifies the average speed as well as the average speed in motion. In the pictures attached you can see how the lifts are schown as ski runs, also you can see the speed tracking with lift runs included. I've also attached a pic of a skiing activity from last year with an older software version, there the lift runs are not tracked in the speed.
Here for comparison the speed data from last year with old software version:
It would be really great, if you could bring the heat map of the speed on the map back!