ClimbPro and routes

Hi all,

I have a question on the ClimbPro feature.

Up to now I used this feature only by loading gpx tracks (or courses) into the watch with Garmin Connect, and they worked pretty well.

Yesterday I was biking and I made the Fenix calculate a route to a waypoint. I was expecting the ClimbPro to work as well, but actually it showed the altimetry only up to the point where I was: from there on, it was only a flat line.
I thought the watch could retrieve the elevation info from the map DEM, but apparently it can't.

Does anyone have some info on this?