User can't select CIQ data field on Fénix8

Recently, I was contacted by a user reporting that he can't use one of my data fields on his Fēnix 8.

After some analysis, we realized that this occurs with the Treadmill, Trail Running, and Ski activity profiles, regardless of which data field he tries to use, while there is no issue with others (Bike, Indoor Cycling, Run, ...).

I know that Garmin restricts the use of CIQ data fields for diving activities for safety reasons, but I didn't expect this to apply to these profiles as well.

Can anyone confirm if these restrictions also apply to Treadmill, Trail Running, and Ski?