forge 14.23.5.2860
Minecraft forge 1.12.2

What happened to cause the crash? Can you reproduce it with only OpenComputers / whatever other mods have any blocks that may be involved?

oc is calling getWorld.notifyNeighborsOfStateChange in that stack, but the crash happens in World.java
could be chunk load related, could be another mod trying to do something special with chunk loading.
we'd need a minimal repro please