Strange behavior with repeat immediately before alternate endings

[Cameron Hall]

I've run into a strange problem that I think may be a bug. In this MWE,
I have a repeat with alternate endings. However, the "\repeat unfold 3
{ c1 }" is causing the volta brackets to disappear for some reason. If
I instead write out "c1 c1 c1", it works as expected. If I add another
note right before the "\alternative", it also works as expected.
However, if there's a repeat right before the "\alternative", it messes
up.
%%%
\version "2.24.4"
\fixed c'' {
  \repeat volta 2 {
    \repeat unfold 3 { c1 }
%    c1 c1 c1
    \alternative {
      \volta 1 { d }
      \volta 2 { e }
    }
  }
  c4 r r2
}
%%%