Glissando to nothing example in docs

[Richard Shann]

At https://lilypond.org/doc/v2.25/Documentation/notation/glissando
under the section
Contemporary glissando
is this example (without the whole bar rest at the end).
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\version "2.25.18"
\relative c'' {
  \time 3/4
  \override Glissando.style = #'zigzag
  c4 c
  \cadenzaOn
  c4\glissando
  \hideNotes
  c,,4
  \unHideNotes
  \cadenzaOff
  \bar "|"
 % R1*4/4 
}
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When the whole measure rest is present two whole measure rests appear and an 
empty bar.

Is there a fix for this?

Richard Shann