Perhaps an interesting solution would be to utilize the waterlogged fence post feature, and continue the post underwater for a few blocks until it meets ground?
Just had it happen. Was trying to figure out kelp and it just crashed when i tried to switch out.
I didn't need to even be in survival mode. I put down a crafting table, attempted to use it, and when I tried to get out it crashed.
My apologies. You can close this report out. FVblco was correct and I hadn't paid attention to that setting when I loaded the world to start testing bugs. Egg on my face :/
Provided an image with seed and coordinates. The igloo also did not have a Zombie Villager ....
I don't think brown mushrooms are affected.
Appears to happen with any block put on top of it.
Confirmed for 18w49a