Gullet spawns depending on what you're sitting on.

I'm Kinla.
So,
this has happened to me in the past when just sitting in a minecart for too long in a lit up room. (Not sure if this still happens,haven't tested recently, had no reason to).
But recently I've been using a sled more often exploring Open World on it. Traveling for 30+ mins I discovered a Gullet would spawn by me once I stopped traveling walking normally off the sled. It would spawn during the day, on the surface. Reminded me of the minecart thing so figured it was the same reason.
Don't know if this is a bug or intentional but thought I'd report just in case.