This crash occurs when 64 pistons in one chunk either retract or extend.
See also MC-108358 (32 pistons in one chunk).
To reproduce the crash you can use the attached structure file, one has 100, the other 63 pistons (add 1 to make it crash and make sure that build is in one single chunk).
Just flick the lever once or twice, and the game will crash.
Screenshots of my crash output attached, crash log by Panda4994 who could confirm it attached as well, the 64 pistons in one chunk I assumed are confirmed now by Xavom.
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Panda4994
I can confirm.
Also some people commented on the similar (fixed) issue MC-108358 about this behaviour.
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Can confirm using 64 pistons in 1 chunk.
crash report with java.lang.NullPointerException: Ticking block entity , similar to those that are already attached.
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Thank you Xavom 🙂
Erik Broes
Thanks for taking the time to report this so clearly!
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I can only guess how much you few Java Devs have to do, thus it's just fair to try to help as much as possible within one's capabilities, so you can pinpoint it faster, and I'm very happy there are some people who are willing to contribute to make this process even faster 🙂
Thank you for fixing it so fast/before 1.13, have a good holiday.
Erik Broes