There’s another conversation about this somewhere in the forum (Unmaintained Track Roads). I think I excluded track after seeing some actual tracks (those circular running things that aren’t streets 
) in CityStrides.
The next update re-adds the highway=track so the next city update after I release that will re-add those streets. I don’t know when I’ll release that, because it also includes a huge JavaScript overhaul & I need to have time post-deploy to handle any bugs I missed in development. I’m guessing either this evening or sometime Saturday.