> I found bug in arrangement duration dots in a specific case: [...]
There is no bug. Using `\hideNotes` only makes note heads (and dots)
invisible, but they are still positioned. You should rather try
something like the following.
```tex
\version "2.24.3"
\new PianoStaff <<
\new Staff = "1" <<
\new Voice \relative a' {
\voiceOne a2 g4 c
}
\new Voice \relative e' {
\voiceTwo e2. g4
}
>>
\new Staff = "2" <<
\new Voice \relative c' {
\clef bass
\voiceOne \change Staff = "1"
\once \stemDown
c2.
\showStaffSwitch
\unHideNotes \change Staff = "2"
c4
}
\new Voice \relative a, {
\voiceTwo a4. b8 c4 e
}
>>
>>
```
Werner
