Java Edition 12w30c

12w30c is the seventeenth snapshot for Java Edition 1.3.1, and was released to fix some of the bugs and crashes in the 12w30a and 12w30b snapshots.

Fixes
5 bugs fixed


 * Fixed piston block animation bug.
 * Fixed rain particles in certain biomes.
 * Fixed Mob Spawners set to spawn FallingSand entity crashing the game.
 * Fixed minor text bugs.
 * Fixed portal placement.