When using the /locate command to try and find an igloo, the coords it gave me led me to the bottom of the world, with nothing there. The first time it occured, there was a mineshaft near the coords, but in a new world there wasn't even a cave present.
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I tried this twice in 18w14b. The first time, I did find an igloo at the location found by the locate
command. The second time, I didn't find an igloo, but I did find some oddly placed snow blocks. I attached a screenshot.