@Override
public CompletableFuture<Either<Chunk, ChunkHolder.Unloaded>> setDefaultProtoChunk(ChunkPos chpos, ThreadExecutor<Runnable> executor)
{
    int i = ChunkStatus.EMPTY.getIndex();
    CompletableFuture<Either<Chunk, ChunkHolder.Unloaded>> completableFuture2 = CompletableFuture.supplyAsync(
            () -> Either.left(new ProtoChunk(chpos, UpgradeData.NO_UPGRADE_DATA)),
            executor
    );
    updateFuture(completableFuture2);
    futuresByStatus.set(i, completableFuture2);
    return completableFuture2;
}