percent and bar lines

[Niels]

is it possible to use 'repeat percent' including special bar lines?
I tried:
\version "2.20.0"
\score {
  {
  \time 1/4
  \repeat percent 12 { c''4 \bar "!" }
  r4
  \bar "|."
  }
}

In the score the dashed bar line (\bar "!") appears only after the first 
note and not after the percent signs. How can I have all bar lines dashed?

Niels