Downhill Strava Live **running** segments aren't synchronizing

It appears none of my downhill running Strava segments are synchronized to the watch. Has anyone else noticed that?

Downhill segments are quite popular among trail runners, and I have quite a few starred. Missing them on the watch makes the whole Live Segments feature much less valuable for trail running. What's especially strange is that having a segment that has net gain of 0% is fine even though that may include both uphills and downhills, but a pure downhill segments seem to be skipped.

I remember reading somewhere that downhill cycling Strava segments aren't synchronizing to Garmin devices. But why that has to apply to running too?