I heard about this when UEFN was released, and it has affected my map that I converted from creative to UEFN as well. Strange thing about mine is that I had XP devices in creative that actually carried over to my UEFN map. I could configure them all I wanted and even direct bind them to trackers, but they don’t work in my test-game.
Unfortunately I have no idea when the feature will return. My best guess is that we’ll just have to wait until some future update. After all, UEFN is still in only the very earliest open beta stages.