Re: Duration dots are badly arranged

> 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