Magma Blocks Are Not Generated In The Nether Of Worlds That Were Created In Earlier Versions

Magma blocks are not generated in the nether of worlds that were created in earlier versions, 1.1.2, 1.1.1, 1.0 and all other old versions.
How to reproduce? 1- Enter a nether that was generated in version 1.1.2 or lower. Look for magma blocks. You should do this test in version 1.1.3 in a world created in version 1.1.2 or lower.

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