Java Edition 13w12~

13w12~ were two debug snapshots for 1.5.1 that attempted to fix an issue with the frame rate dropping significantly when using smooth lighting. The first debug snapshot was unsuccessful, however the second debug snapshot was successful in fixing this bug. The first snapshot was released on Mojira as a "temporary snapshot", which is why these snapshots don't follow regular naming conventions.

Fixes
1 bug fixed
 * – FPS drop due to smooth lighting.