annotate-spacing doesn't print horizontal values 2.9.6

[Graham Percival]

%%% no horizontal spacing doesn't print line-width, left-margin, etc.
\version "2.9.6"
\paper{ annotate-spacing = ##t }
\header{
  title = "Insert Witty Title Here"
  composer = "Me, myself, and I"
}
\score{ {
    \repeat unfold 16 { c'4 c' c' c' }
  }
}