\grace at meter change

[David Bobroff]

In the following Lily code, with or without the spacer \grace in "two",
the grace is placed before the time change.  Workaround?

-David

\version "2.1.30"

meter = \notes \context Voice {
    \time 3/4 s2.
    \time 4/4
}

one = \notes \context Staff {
    c2.
    \grace {c8} 
    c1
}

two = \notes \context Staff {
    c2.
%    \grace s8 % makes no difference in output
    c1
}

\score {
    \notes \relative c' {
        \context StaffGroup = Score {
            <<
        
                \new Staff {<<\one \meter>>}
                \new Staff {<<\two \meter>>}
            >>
        }
    }
}