percent repeats followed by grace notes

[Vaylor Trucks]

This might be a bug that's already know but I wanted to check to see if
anyone has a workaround.

If you follow a multi-bar percent repeat with a grace note, the result it
that the last measure is squashed a bit.

Without the grace note everything is equally spaced.

Here's a small example that illustrates what I am seeing.

\version "2.22.0"
up = \drummode {
  \repeat percent 3 { sn8[ sn sn sn] sn[ sn sn sn] }
  \grace sn8( sn8)[ sn sn sn] sn[ sn sn sn]
}
\score { << \new DrumStaff << \up >> >> }