The game crashes when opening a chest containing a locked chest.

Normally, the chest would open fine. However, in the newest snapshot, the game crashes upon opening the chest, possibly meaning that the texture is not loading due to the new texture pack format having no texture assigned to the locked chest.

Of course, if this is the case, the act of putting the locked chest in the chest would mean seeing the locked chest beforehand, crashing the game. If '/give [ name ] 95' is typed in it would give the player a locked chest, and if this causes the game to crash it can be assumed that the texture is the thing that's causing the crashing.