Writing element each to its own file, problem on last element

I want to save each element in the stream to it’s separate file. I’m not sure if I’m missing something or there is a bug, as for the last element the file is always created but it is empty.

val done =
    Source(1 to 4)
      .map(i => ByteString.fromString(i.toString))

      .toMat(
        LogRotatorSink.withSinkFactory(
          triggerGeneratorCreator =
            () => n => Some(Path.of(new String(s"file${n.decodeString("UTF-8")}" + ".txt"))),
          sinkFactory =
            (path: Path) =>
              Flow[ByteString].toMat(FileIO.toPath(path, Set(CREATE, WRITE, TRUNCATE_EXISTING, SYNC)))(Keep.right)
        )
      )(Keep.right).run

  Await.ready(done, 2.seconds)
  system.terminate()
  Await.ready(system.whenTerminated, 2.seconds)

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