TickNextTick list out of synch bug #116
Description
As mentioned in #115, tracked down originally over in the EnderCore git issues (link), and in several threads on CurseForge (here is one), TickNextTick list out of synch is a bug that RandomPatches attempts to fix but has some difficulty doing in 1.16.1. This thread may serve as a superthread for its debugging & reporting, as #115 is written to be Enigmatica-specfic. If so desired by the contributors I'll remove this report & put it as a comment into #115.
Exceptions tend to look like the following:
[27Jul2020 03:16:30.570] [Server thread/ERROR] [net.minecraft.s
erver.MinecraftServer/]: Encountered an unexpected exception
net.minecraft.crash.ReportedException: Exception ticking world
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:856) ~[?:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:788) ~[?:?]
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:81) ~[?:?]
at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:643) [?:?]
at net.minecraft.server.MinecraftServer.lambda$func_240784_a_$0(MinecraftServer.java:230) [?:?]
at net.minecraft.server.MinecraftServer$$Lambda$6550/1020321556.run(Unknown Source) [?:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]
Caused by: java.lang.IllegalStateException: TickNextTick list out of synch
at net.minecraft.world.server.ServerTickList.func_205365_a(SourceFile:54) ~[?:?]
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:329) ~[?:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:852) ~[?:?]
... 6 more
Exceptions are accompanied by a brief freeze (sub-1-second) and a crash-to-launcher.
In my experience, it is more frequent when chunk generation/loading is backlogging server ticks. Examples include fast travel in creative, using /tp commands, and when entering/exiting the Nether in previously ungenerated areas.
Prior to recent commits (faef98 and a5563c) it seemed to me to arise most frequently in the presence of multiple hostile mobs/mob spawners. Since those commits this behavior is absent and crashes are far less frequent (occur on an hourly basis, not minutely basis).