Xbox One? I'm on PC so this will be not that accurate, but you might try it out
The missing mane bug was fixed in the previous update (unless 1.12 brought it back?), there's probably just some leftover codes that's circulating somewhere. if so you just need to overwrite your savefile, exit the game and load back in with that savefile. This fixed it for me when I had this very same bug last year. If this doesn't fix it you probably need to start a new game up to the point when you're getting Roach, save a new file, exit the game and load back into you're existing save file where you had the bug. if the bug is still there try overwriting again over your new save file and exit the game.