Problem with lilypond 2.2.6

[Rolf Rolfs]

Hello all,

I'm using lilypond v. 2.2.6 and have the following problem:

In the following snippet

>     \repeat volta 2
>     {
>         d'''4 c'''8 b'' a'' g'' |
>         g''4 f''8 es'' d'' c'' |
>         c''4 b'8 a' g' fis' |
>         fis'4( g'8) g'' b'' d''' |
>         d'''4 c'''8 b'' a'' g'' |
>         g''4 f''8 es'' d'' c'' |
>         c''4 b'8 a' g' fis' |
>     }
>     \alternative
>     {
>         {
>             fis'4( g'8) g''8 b'' d''' |
>         }
>         {
>             << { fis'!2( g'8) } \\ { \hideNotes d'''2 d'''8 \unHideNotes }  >> 
> r8 |
>
>             \bar "|."
>         }
>     }

the fis in the first alternative is correct, the fis in the second 
alternative is shown without the #.

What is wrong here?

The hidden notes are there to have the alternative bars in the correct 
position.

Many thanks in advance!

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   Rolf Rolfs
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