The game crashes while converting the world old world from MC-63070, namely: https://docs.google.com/file/d/0B57wgZSp2XofSXc4V1BLc1c5aU0/edit to the new version. Note that @unknown did not have this issue, see his comment.
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Also some mod should merge some of the tags I used for this issue; I mean "conversion convert converter converting"..? get real.. 😛