ConcurrentModificationException during world load in single player

[JaisDK]

https://gnomebot.dev/paste/mclogs/9clgQn9

Because HiddenManager.hidden is a static that's shared between the internal server and the client when you're in single player, modifying it on one side while it's being iterated on the other side can cause a CME.

It get modified here after the client sync https://github.com/Cmdpro/Databank/blob/main/src/main/java/com/cmdpro/databank/handlers/ModEventHandler.java#L52
while on the client it's being cleared and refilled.

These two lines https://github.com/Cmdpro/Databank/blob/main/src/main/java/com/cmdpro/databank/networking/packet/HiddenSyncS2CPacket.java#L41-L42

HiddenManager.hidden.clear();
HiddenManager.hidden.putAll(hidden);

need to be HiddenManager.hidden = new HashMap<>(hidden);

[JaisDK]

or just don't share a static between the two sides