Breaking Minecart or boat while riding in it makes you fall through blocks

@Ed Kelly: Cannot reproduce falling through the ground if Minecart is ON rail. Please attach screenshots to MC-23990
Can reproduce in F5 (3rd person) mode

Oh. I have accidentally reposted this. Crap. Mine was at MC-27303

I just wanted to add a note that we've been seeing this on our 100% vanilla 1.62 server. We have various train stations and under a one block floor are the wiring rooms. For some stations you just "dismount" the cart to get out. But I was testing to see how we could break the cart while riding it (the new mechanic was a very poor design decision by the way as you have to chase after carts all the time). I shot an arrow at it to break it and ended up in the wiring room. Other stations use a cactus/hopper setup based on a 1.5.2 sethblng design and when we arrive at the station we also end up in the wiring room when the cart breaks. However, in some cases if you try and move when the cart breaks, you can sometimes avoid it.

It still exists in 13w36b
http://i.imgur.com/wFqKpoh.gif

Another way to reproduce this is to ride a boat off a cliff. Boat breaks, and you are in the ground. And this still happens in 1.7.2

Still a concern in 1.7.4, 1.7.5 and 1.8.

I know that I created a report as well, but to be honest I see more potential in this bug than issue. Careful building will prevent fall deaths, and similarly careful building will enable completely hidden entrances...

Edit: Also, I'm 90% sure that the bug is caused by the fact that the player's lower body is clipped into the ground when in a minecart, but the player's body isn't responsible for the motion while in the minecart. So, when you break it you continue clipping instead of being forced into your correct position as you would when you exit the vehicle proper... But, that's just a likely cause. 😛

Confirmed for 14w19a.

Confirmed for 1.8. MC-65854