Analysis brackets don't work with spaces

[Eliot Handelman]

Hi,


The following code generates the markups but not the brackets. 
Is there some way to get brackets printed when they are attached to spaces? 

many thanks,

-- eliot


\version "2.10.33"

\header { title = "Brackets don't work with spaces" }

A = {
  \time 4/4
  \clef treble
  s2\startGroup^\markup { \column { 1 } } 
  s2\stopGroup^\markup { \column { 2 } } 
  \bar "|."
}

\score {
  << 
    \new Staff << \A >>
  >>
  
\layout {
    \context {
  \Staff \consists "Horizontal_bracket_engraver"
}
    
  }
}