grace notes/acciaccaturas occur before time signature change if only in bass clef

[Jin Choi]

In the following snippet, a change of time signature appears after an 
acciaccatura if the time change happened in one staff without a grace note but 
a grace note appears in some other staff. Is there a way to fix this without 
making sure the time change always appears in the staff with the grace?



\version "2.24.1"

upper = \relative c' {
  \key c \major
  c1
  \time 2/2
  c1
}

lower = \relative c {
  \clef bass
  c1
  \acciaccatura c8 c1
}

\score {
  \new PianoStaff {
    <<
    \new Staff = "upper" \upper
    \new Staff = "lower" \lower
    >>
  }
}