v2.23.8: \fine seems to break \midi

[Nikolai Hedler]

Windows 10, 64-bit

I discovered the new \fine feature and looked to implement it in a project
of mine, and I believe I've discovered a bug in its interaction with \midi
blocks. The following appears to be a minimal example which produces the
error for me:

\version "2.23.8"
\score {
  \unfoldRepeats
  \relative f' {
    \repeat segno 2 {
      c1 \volta 2 \fine
      c
    }
  }
  \midi { }
}

The expected result is 3 notes played, but it inexplicably produces 4. The
log includes the following inscrutable error in duplicate:

programming error: asked to compute volume at +3.000000 for dynamic span of
duration 3.000000 starting at 0
continuing, cross fingers

Not sure what other info may be helpful.

- Nikolai