>> This is the infamous issue #34.
>
> I don't actually think so: the symptoms tend to be generally
> different and connected with context creation. This here does just
> look like typesetting things as written, with some things typeset
> with and some without grace timing and consequently lined up
> differently.
Honestly, I don't care about the details. With "issue #34" I subsume
all synchronizing problems due to grace notes. If you think this is
an invalid generalization maybe more issues are needed.
Werner