实验性实验性Adds a callback that will be called when an internal message is passed.
无法在只读模式下调用此函数，详见 WorldBeforeEvents。
This function can be called in early-execution mode.
实验性Removes a callback from being called when an internal message is passed.
无法在只读模式下调用此函数，详见 WorldBeforeEvents。
This function can be called in early-execution mode.
Manages callbacks that are message passing to a server. This event is not currently fully implemented, and should not be used.