2.23.3 Contemporary glissandos

[Paul Scott]

Adding a rest to the contemporary glissando snippet (1,3,3) in the 
notation manual results in a barcheck error\version "2.23.3"

\relative c'' {
  \time 3/4
  \override Glissando.style = #'zigzag
  c4 c
  \cadenzaOn
  c4\glissando
  \hideNotes
  c,,4
  \unHideNotes
  \cadenzaOff
  \bar "|"
  R2.
}

glhatest.ly:14:3: warning: barcheck failed at: 1/2

  R2.

TIA for any help,

Paul