What I expected:
When trying to place a torch on a wall while looking at the ceiling block next to it, the torch should be automatically placed on the wall, nothing more, nothing less.
What happened:
When I placed a torch on a ceiling block next to a wall, a mob head with unknown texture (you know, that classic black-purple checked texture) appeared instead of the torch (at least it seemed to be a mob head)
-EDIT:
The bug seems to be caused when you are trying to place a torch on a block where it can´t be placed (and can be placed next to it), e.g. trying to place a torch on glass in the corner of the room makes the torch to be placed on a non-transparent block next to the glass block, causing the same bug as the ceiling replace.
Also added a new screenshot with this situation.
Steps to Reproduce:
1. Look at a ceiling block next to a wall made of any block (that can hold torches)
2. Place a torch on the ceiling block
3. A mob head with missing texture appears on the wall instead of the torch, it disappears after a split second, then a torch will be normally placed on the wall.
Some Screenshots Included.
Map info in comments.
Sorry for so much edits, only the listed one is "breakthrough".
Ladislav Bielko AKA Terry125
If you want to know what exactly was built on my map, it is:
A machine made of redstone & command blocks that automatically kills all chickens spawned
Another redstone & command block machine that creates primed TNTs in the air and teleports them to XPorbs in 200 blocks range (see sethbling`s video "Explosive Projectiles -- Minecraft Mapmaking Trick" at http://www.youtube.com/watch?v=vxDi41dmgMc
A sandstone cuboid with a capacity of 3192 blocks, used for the explosive projectiles
Two command blocks that resets the cuboid and removes dropped items
However, turning all the machines off does not change or remove the bug, it`s still there.