Tie between repeat and alternative

[Alberto Simões]

Hello

When the last note from a repeat includes a tie, the first note from the
alternative gets rendered correctly. But the second alternative don't.
Any way to make it work?

\repeat volta 2 {
   r4 e4 ~
}
\alternative {
  { e4 f4 }
  { e4 r  }
}

Thanks.
-- 
Alberto Simões