So I tried to do something funky. I logged in and entered my survival world and went AFK fishing for a while. Then, I joined the same world via the Singleplayer HUD, but with a different account, and then logged out after moving places for about 30 seconds. When I tried saving the world after an AFK session that day, it takes noticeacbly longer time to do so compared to previous performances. The next day, when I joined that world again, I found... this.
I know this isn't how I am supposed to play the game, but... yea.
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Oh, and if there is anyway to reverse this... please let me know. I spent quite some time on the 2-spawner cave spider dungeon.
And something I forgot to mention in the report: All entities inside the affected area disappeared.

Here's the world folder, compressed as a zip file, uploaded to Google Drive:
https://drive.google.com/open?id=1AuviU12oPEv0uuFKsUJcMKZWP_8HRijy