transposing \chords does no longer work

[Andre Kienast]

   %\version "2.16.0"  % Execution of line 9 (2nd transpose) works fine
   \version "2.17.29" % Execution of line 9 (2nd transpose) works not fine
   %line 3
   MelSopOne=
    \transpose ees d {  % transpose works fine for notes
      \relative ees' { r2 r4 bes4 | g' g f g | ees2 bes4 r | }
    }
   harmonies =  \chords  {
    \transpose ees d {  % /transpose results in message "Wrong type
   argument in
   position"..."expecting Pitch"
      R1 | ees2 bes | ees1 }
    }
   \score {
     <<
       \harmonies
       \MelSopOne
     >>
   }
   Known issue?

   Thank you,
   Andrew