Similarly, it seems to fail on "The old man the boat", marking "man" as a noun. The meaning of the sentence however, in this case, is fairly unambiguous, but parsing it can be tricky. See other: https://en.wikiped.org/wiki/Garden_path_sentence
In some sense, it's a mark of success for an AI system to fail in the same way that humans do. "The old man the boat" is a terrible sentence, essentially ungrammatical.
