New running Coach Problem

I have the new running Coach that adaptivity changes my workouts, just like DSW. 

I use always Heart rate as target.

I realized that, when I get suggested sprint intervals as workout, the target stays at heart rate and do not change to  Pace for the interval segments. 

I know from DSW, that even if I had heart rate as target, the short sprints are Pace Target. 

It makes no sense to use heart rate as target for sprints, so can someone fix it please?