This topic is broadcast from the ISaveGameService when a Chunk finishes deserializing from a save file. The payload's value carries the Chunk that just finished deserializing. When loading a save file with multiple serialized Chunks, this topic is broadcast at the completion of each Chunk's deserialization individually. This is an Async Topic whose callbacks can be long running Tasks. The service will await for all listeners to complete executing their callbacks before resuming the operation.