[1.12.2] OnBlockUpdating called in async

[EdoEquin0x]

Hello, it seems that when a frame is bigger than 1 in width or height, the subparts of the frame are placed in async, and it one instance it caused a crash.

java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1469)
    at java.util.HashMap$KeyIterator.next(HashMap.java:1493)
    at net.minecraft.server.management.PlayerChunkMap.tick(PlayerChunkMap.java:130)
    at net.minecraft.world.WorldServer.tick(WorldServer.java:351)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:884)
    at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:461)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:778)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:624)
    at java.lang.Thread.run(Thread.java:750)

Other times it simply spams a warning, but still, it seems to be something worth investigating.

[Toshayo]

Hello! Thanks for the report! Do you mind sharing the mod list so I can test it locally as well, please?
Btw, there's no subparts of frames, it's only one block that renders a big image. Does the issue happens with a projector as well?

[EdoEquin0x]

Hello! Thanks for your quick response! I use Alfheim, Cleanroom (it happened without running on a cleanroom server), VintageFix, Nothirium and CensoredASM (as well as WaterFramesBackported, of course). The issue can be reproduced on a Mohist and/or Catserver server, as well as Catroom (Catserver + Cleanroom), but as I specified earlier it's not a special case. And for the projector yes, it does happen too !