Contemporary glissando

A contemporary glissando without a final note can be typeset using a hidden note and cadenza timing.

\version "2.24.0"

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