I destroy a repeater in-front of two observers, replace it and immediately destroy it after it powers on. Then it crashes immediately. It is reproducible every time.
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Same stacktrace as MC-123304.
MC-123555
Ticking Block Entity
Resolved
Duplicate
0
Mario
(Unassigned)
Unconfirmed
Minecraft 17w50a
Retrieved
Can you attach a screenshot of your setup?
The crash references pistons, so I'd assume you have pistons somewhere in there, but you haven't mentioned exactly where.