issues with "afterGrace" since 2.20

[Ahanu Banerjee]

Hello,

In lilypond 2.20.0, I was able to use "afterGrace" like this:

\version "2.20.0"

\language "english"

\relative c' { d2 \afterGrace 4 { cs16 d } }

However, this now presents an error: "warning: \afterGrace exceeds duration of main argument". Running ly-convert does not fix it.

If I change "\aftergrace 4" to "\aftergrace d4", it works fine. However, I have multiple documents written with the aforementioned syntax, and it would take a long time to fix them manually. Any suggestions? 

Thanks,

-Ahanu