Double time signatures

[Henrik Frisk]

Hi,

Just noticed an odd thing with time signatures. The following prints
double time signatures at the beginning of a bar:

\version "2.9.11"
\score {
  <<
    \new Staff \relative c' {
      \time 8/8
      \acciaccatura c16
      c4 d4 r4 r4
    }
    
    \new Staff \relative c' {
      \time 8/8
      s4 s4 r4 r4
    }
  >>
}

Remove the \time 8/8 in the second staff and everythings back to
normal. It only happens when there's a grace note at the beginning of
the bar which leads me to believe that this is a bug???

/henrik