If you destroy a boat or minecart it'll be dropped in Creative Mode. It's really annoying if you test your minecart coaster a couple times. The inventory fills up with minecarts.
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This isn't a bug. This is more of an annoyance. This should be closed for this. Remember Mr.Mod, the Minecraft Forums are for suggestions. 😛
I thought it was. Items are not supposed to drop if they were broken in creative mode, paintings used to and they were fixed as a bug a while ago. Correct me if I'm wrong.
This is definitely a bug. Blocks don't (usually) drop in creative mode, so why should minecarts or boats?
Finally this has been fixed. It was really annoying having an entire inventory full of minecarts and then having to clear them. Why can't minecarts be stacked?
I agree that it shouldn't drop. This also happens when testing contraptions with boats and it's annoying to have an inventory full of them.