Yes, I noted that the problem doesn’t occur in my snippet. I will try to add 
things to it until I can get it to happen. In my full text, I have just had it 
happen again, in a similar passage where both parts leave the upper stave. 
Forcing a voice to “hold open” the staff again fixes it for me.

> On Aug 15, 2023, at 9:37 PM, William Rehwinkel <[email protected]> 
> wrote:
> 
> It should be noted that on 2.25.7 this doesn't happen on my machine, and the 
> beam renders correctly (after running convert-ly on your snippet, it didn't 
> change anything).
> 
> -William
> 
> On 8/15/23 18:11, Jin Choi wrote:
>> 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?
>> 
>> \version "2.24.1"
>> 
>> top = { \change Staff = "upper" \voiceTwo }
>> bottom = { \change Staff = "lower" \voiceOne }
>> 
>> upper = \relative c'' {
>>   \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
>>     >>
>>   }
>> }
>> 
> 
> -- 
> + ------------------------------------------- +
> |   William Rehwinkel - Oberlin College and   |
> |                          Conservatory '24   |
> |        [email protected] <mailto:[email protected]>   
>       |
> | PGP key:                                    |
> | https://ftp.williamrehwinkel.net/pubkey.txt |
> + ------------------------------------------- +

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