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.
Environment
OS: Windows 10 Pro
JRE: 8u151
GPU: Intel HD Graphics 4400
CPU: Intel i3-4160 @ 3.60 GHz
Linked issues
duplicates 1
Attachments
Comments 3
Same stacktrace as MC-123304.
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.