The replication layer is currently part of the server and is planned to be between the client and the server.
Instead of the player connecting directly to the server, resulting in a 30k error if the server crashes, the player and the server are to both connect to the replication layer.
Among others it allows server crash recovery, so that if the server crashes, the client stays up, still connected to the replication layer, and when the server comes back up again or a new one replaces it, it comes back to its state before the crash.
References
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