Fast travel is important with Citadel: Forged With Fire, but it had an obnoxious and somewhat weird little quirk: Hopping through a portal wouldn’t bring the mount you tamed through the portal with you. So you would have to wait for it to catch up with you from half a world away, and while the mental image might have been hilarious it didn’t make a whole lot of sense. Not so any longer, though! The game now allows tamed critters to follow you through quick travel, so you both wind up at your destination at the same time.
Content retrieved from: http://massivelyop.com/2018/04/22/citadel-forged-with-fire-lets-you-bring-your-tamed-creatures-with-you-through-fast-travel/.