Minecraft PE Beta 1.18.30.30/31

Unexpectedly a new beta version of Minecraft 1.18.30.30 was released. In it, the developers urgently fixed one serious bug.

Fixes

• We have addressed an issue from the last beta that caused chunks below y=0 to become corrupted. The chunks will no longer become corrupted but any chunk that was affected will revert to its original world generation.