Thanks, you were right. There was an unterminated Slur.outside-staff-priority 
override that was causing the problem. This snippet displays the flying beam:

\version "2.24.1"

top = { \change Staff = "upper" \voiceTwo }
bottom = { \change Staff = "lower" \voiceOne }

upper = \relative c'' {
  \override Slur.outside-staff-priority = #300
  
 \time 2/2
 \key c \major
 \voiceOne
 r8 bes'\mf( a gis a ees d cis |
 d bes a gis a ees d cis |
 d) bes'\dim( a\! gis a ees d cis |
 d[ \bottom bes a gis] a[ ees d)] r8 |
 \top 
 \oneVoice
 r8\p
}

lower = \relative c' {
 \clef bass
 a4 r8 \top bes'( a gis a ees |
 d cis d \bottom \voiceTwo bes a gis a ees |
 d cis d bes' a gis a ees |
 d cis d bes a gis a cis | 
 \oneVoice
 fis,4)

}

\score {
 \layout {
   \context {
     \Staff
     \consists Merge_rests_engraver
   }    
   \context {
     \PianoStaff
     \override StaffGrouper.staff-staff-spacing.basic-distance = #11
     \override TextScript.avoid-slur = #'outside
     \override TupletBracket.bracket-visibility = ##f
   }
 }  
 \new PianoStaff {
   <<
   \new Staff = "upper" \upper
   \new Staff = "lower" \lower
   >>
 }
}

> On Aug 16, 2023, at 3:51 AM, Paul Hodges <[email protected]> wrote:
> 
> I note some other differences between your image and what the code sample 
> generates, in the slur and dynamic positions.
> 
> I can't suggest what in particular is happening, but if this happened to me, 
> I'd be looking for an earlier tweak or override which hadn't been cancelled.
> 
> Paul
> 
> 
> From: Jin Choi <[email protected]> 
> To: <[email protected]> 
> Sent: 15/08/2023 23:11 
> Subject: strange detached beam issue 
> 
> I have a section of piano music where two voices start in the treble clef and 
> subsequently move down into the bass clef. When the right hand moves down, 
> the beam stays in the treble clef unattached to anything: 
> 
> When I try to isolate this section, the problem does not occur. I am 
> mystified as to what is going on. What might be some things I could try? 

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