Rehearsal mark and fermata over bar line

[Rachel Green]

Hi,
How can I add two marks over a bar line - both a fermata and a rehearsal mark? 
I figured out how to do each separately, but LilyPond will only show one of 
them.
Best,
Rachel

\version "2.20.0"

\relative c
  {
  \time 4/4
  \clef C
  c1
    \mark \default
    \mark \markup { \musicglyph #"scripts.ufermata"}
  r4 r4
}