Text markup length and bar spacing

[Lib Lists]

Hi everybody,
I'm trying to find the right option to make sure that the bar spacing
follows the length of a text markup.
See this example: if it's one bar long it works, if 2 or more it doesn't.

\version "2.25.19"

\score {
  <<
    \new StaffGroup <<
      \new Staff = "upper" {
        c'4 -\markup {"A very very long markup text, soooooo long"} d' e' f'
      c' c' c' c'}
    >>
  >>
}

\score {
  <<
    \new StaffGroup <<
      \new Staff = "upper" {
        c'4 -\markup {"A very very long markup text, soooooo long"} d' e' f' }
    >>
  >>
}

Thanks in advance for any hint,
Lib