Breathing mark and caesura

[Andrew Bernard]

I can change \breathe into a caesura by following the NR. But how can
I revert it? The following does not do it. As usual, I am missing
something.

Andrew

%=====================

\version "2.21.6"

{
  c''4 \breathe c''
  \override BreathingSign.text = \markup {
    \musicglyph "scripts.caesura.straight"
  }
  c'' \breathe

  %\revert BreathingSign.text
  c'' \breathe
}