Barline doesn't whiteout stave lines sometimes

Dear list,

In the following example, the stave lines overlap the barlines at the 
end of the bottom two staves (the expected behavior would have been for 
the stave lines to be interrupted by the bar lines like the others).

Thank you,
-William

% -----------

\version "2.25.4"


notes = \repeat unfold 6 \relative c' { c4 c c c \bar "." }

\score {
   <<
     \new Staff \notes
     \new Staff \notes
     \new Staff \notes
     \new Staff \notes
     \new Staff \notes
   >>
   \layout {
     \context {
       \Staff
       \override BarLine.color = #red
     }
   }
}

% -----------

-- 
+ ------------------------------------------- +
|   William Rehwinkel - Oberlin College and   |
|                          Conservatory '24   |
|[email protected]          |
| PGP key:                                    |
|https://ftp.williamrehwinkel.net/pubkey.txt  |
+ ------------------------------------------- +