A Running course created in Garmin Connect is recorded as an Other Activity

I created a running course in Garmin connect and synced it to my Fenix 5 Plus. 

I started a Run activity and selecting down, chose Navigate from the option. Then I loaded the course and went running.

I had it display the map as I was unfamiliar with the route.

On saving it didn't recognise that it was a Run, and therefore I had no 1km laps recorded.

I was able to change the type to a run afterwards, but why didn't it just record the activity as a Run?

(I have an Edge 830 and the cycling courses I create in Garmin Connect work fine)