When I created my default superflat world, I saw a 16x16 giant stone tower. It also included dirt and a bit of water. See screenshot. Can provide more info, didn't delete the world.
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This is caused by chunks not being completely deleted when making a new world. This is actually a chunk from a default world.
Oh I know why! I'd created a world with "x" name, then deleted it because I'd chosen the wrong type of world, and then created this one with the "x" name again!
41st Duplicate of MC-315, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.
I searched "stone tower" and "dirt tower", I didn't know it was related with chunks!