It works in the editor:

...and works fine in-game when you test or validate the map.
But when you look at the replay, it's gone, and the car is driving over nothing:

When you save the track, and then re-open it in the editor, the object is gone from the track as well:

The object isn't there when you load the track and try to drive it like normal either. Which basically makes it possible to validate a track that no one else will ever be able to finish.

Known issue? Possible fixes?