When I was teleporting to find a stronghold, client suddenly crashed upon me.
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Had the same issue, also with an iron door. Stack traces look exactly the same as in the original report.
Same issue also happening to me, however the affected block seems to be a water block. It was a ocean biome and there were weird "air pockets" floating underwater of around 2x3x4 blocks in size in the same region as the bug happened. The game is always crashing after less than one minute of flying around this area.
Same crash happened for me while flying ABOVE a stronghold, but after opening the world again nothing happened and I could visit the stronghold normally. The crash was about an iron door instead of a wooden door ("Block: minecraft:iron_door[facing=east,half=upper,hinge=left,open=false,powered=true]), but it was the same "Exception while updating neighbours" crash.
Enviroment: Windows 7