Other then the Beta that was released where using, or having any running, redstone caused the game to crash (where it would have been obvious that the game was fubar'd if they'd bothered to even attempt to test it) this has to be the worst, and most badly executed Beta of all time.
Want proof - check the clip for just random world killing. No idea what happened, but its killed it. Cheers guys.
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Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the problem you are describing in the latest version.
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Cannot reproduce myself on my own PC (using 1.14.0.52 beta)