If you get a Horse into a Minecart, you can't get it back out like you can other mobs. I think the Horse's hitbox is slightly bigger than the Minecart's, so trying to hit the cart only punches the horse in the knees. You have to actually get on top of the horse, then look down and punch the cart while on the horse.
- duplicates
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MC-13937 You cannot break minecarts with large-sized entities inside of them
- Reopened