grace note problem

[Kees van den Doel]

Hi all,

I want to attach grace notes after a note which is last in measure.
Problem is the grace notes are printed in the next bar, which is wrong.

Using \afterGrace is even worse, seems  broken.

Snippet and pdf of problem attached.

Any help would be appreciated. Of course I could make barlines invisible
and insert them manually but that's one step up from fixing the score with
whiteout and a pencil.

Cheers,
Kees

aftergracetest.pdf
Description: Adobe PDF document

\version "2.21.1"

cantus = {
  \time 2/4
  a4 b(\grace{a16 b c')} a2
  a4 b(\afterGrace{a16 b c')} a2
  b2
}

\score {
    \context Staff = "one" <<
      \new Voice = "cantus" {
        \cantus
      }
    >>
  }