Destroying minecarts with chests, with furnaces, tnt or hopper drops a chest, furnace, etc. and a minecart without the description "Minecart". Instead it's called "container.minecart", "entity.MinecartFurnace.name", "entity.MinecartTNT.name" and "container.minecart". It's all ID 328, so it's only a minecart, but it has this name.