voltaOnThisStaff not working as expected

[Eyolf Østrem]

voltaOnThisStaff is documented as follows in the IR:

Normally, volta brackets are put only on the topmost staff. This variable
overrides this behavior, when set to #t or #f.

However, taking a snippet from LSR and trying out various combinations,
always gives the same result: the volta bracket is printed above the top
staff (incl. the ChordNames).

\score { <<
  \new ChordNames \with { voltaOnThisStaff = ##f } \chordmode { c1 c }
  \new Staff \with { voltaOnThisStaff = ##t } { \repeat volta 2 { c'1 } 
\alternative { c' } }
>> }
\score { <<
  \new Staff \with { voltaOnThisStaff = ##f } { \repeat volta 2 { c'1 } 
\alternative { c' } }
  \new Staff \with { voltaOnThisStaff = ##t } { c'2 g' e' a' }
>> }
\score { <<
  \new ChordNames \with { voltaOnThisStaff = ##t } \chordmode { c1 c }
  \new Staff \with { voltaOnThisStaff = ##t } { \repeat volta 2 { c'1 } 
\alternative { c' } }
  \new Staff \with { voltaOnThisStaff = ##t } { c'2 g' e' a' }
>> }
\score { <<
  \new ChordNames \with { voltaOnThisStaff = ##f } \chordmode { c1 c }
  \new Staff \with { voltaOnThisStaff = ##f } { \repeat volta 2 { c'1 } 
\alternative { c' } }
  \new Staff \with { voltaOnThisStaff = ##t } { c'2 g' e' a' }
>> }



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