The current public version 0.0.9e - Is supposed to still have snow. The dev version for the next update has green back on the scene.
The horse was having an identity crisis, it was hired as a horse/carriage, but decided it could actually defy physics and identified as an apache attack helicopter
while THAT, is okay..... That's completely against what the horse was hired for, so it was laid off work while they're trying to either find a replacement horse, or convince the attack helicopter that used your items as ammo for its missle launcher, that if it wants the job it's gotta follow the job's expectations, which is to act like a horse/carriage
i.e The Horse was disabled in 0.0.9e for flying and using you and items placed in the cart, as ammo that it catapulted across the map.