My Fenix8 evaluates this as a base run?!?
That can't be, if you look at the times in the areas!?!

My Fenix8 evaluates this as a base run?!?
That can't be, if you look at the times in the areas!?!

If i remember correctly Garmin uses your default Heart rate zones (the ones calculated on your age) to classify a run. Doesn't matter if you set custom heart rate zones, it will still use the default. In your case the default zones are stretched higher making your custom zone 4 a zone 3.