MinecraftForge/MinecraftForge — pull request #521 by ProgrammerHero (2013-04-15 13:23:11+00:00)
Title: Fixed a bug that prevented proper lava generation near bedrock

To test this, I used the seed -2954127421728660883 and dug down to y=11 at x,z=-5,141 to find a small cave which has 2 small lava lakes. Without this fix the lakes are empty.