this is not a bug. You’re supposed to put the alternative after the repeat
part not inside, so \repeat volta 2 { ... } \alternative { ... }. The way you
have put it the \alternative ... is used as alternatives for the \repeat
unfold (as it is placed after that one), so after the first repeat you get the
first alternative, after the second repeat the second alternative, which is
exactly what you are seeing here.
Thanks for the explanation.
Apparently I misread the documentation.
Kind regards,
Michael
