Crash report here: https://gist.github.com/Spearkiller/06c1311f2c9783f04b169563bf4f710c

I'm not certain that this is caused by just any bog earth, it may just be ones where the maturity has artificially been increased (setblock/debug stick)

Nope it's a Nedelosk bug It is a Nedelosk bug, but you are right that you have to cheat in the block to cause the crash.