Question about repeat alternatives

[Ambrose Li]

Hi,

I am trying to do something like

\repeat volta 4 { ... }
\alternative { {} { ... } }

The idea is that only the 4th repeat has an alternative. But the result is that
the alternative shows up all right, but labelled "1-3" instead of "4". What am I
doing wrong, or is this a bug?

I'm using LilyPond 2.7.36

Thanks