Java Edition 13w38b

13w38b is the sixth snapshot for 1.7.2, and was released to fix some of the bugs and crashes in the 13w38a snapshot.

This version has been removed from the launcher for quite a bit, then it was added back in September 2018.

Additions

 * Added bumpy shader.

Changes

 * Redefined the concept of Air.
 * Is now an actual block instead of the absence of a block (null).
 * It can be kept in the inventory.
 * It looks like a magenta and black checker pattern (the missing texture) in the inventory, when dropped, and when put into an item frame. But when held in your hand, it looks invisible, like an actual air block.
 * Removed marsh-like areas in swamp biomes which were later re-added in.