Affects Version/s: Minecraft 1.4.7, Snapshot 13w03a, Minecraft 1.5, Snapshot 13w11a, Minecraft 1.5.1, Minecraft 1.6.4, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 1.8.1, Minecraft 1.8.3, Minecraft 1.8.4, Minecraft 1.8.5, Minecraft 1.8.6, Minecraft 1.8.7, Minecraft 1.8.8, Minecraft 15w44b, Minecraft 1.8.9, Minecraft 1.9.2, Minecraft 1.9.4, Minecraft 16w20a, Minecraft 1.10.2
Security Level: Minecraft - Public (Viewable by everyone)
Just place a slab of any kind on the upper side of a block many times, and you'll sometime get one that converts to being on the bottom side of a block.
When placing top- or bottom aligned blocks like slabs and stairs server and client disagree about the alignment of placed blocks
Doesn't happen in single player (or isn't visible), but on dedicated server or Realms.
Steps to reproduce:
- Place a block with a well defined center (e.g. stone bricks) at ca. eye level
- Take a stair or slab
- Aim slightly above the center of the block
- Place block
- Client places the block at the correct top alignment
- Server overwrites the block a split second later at incorrect bottom alignment
Screenshots show before and after placement (the in-between position is quite difficult to capture)