Missing 'crossStaff' warning?

[Pierre Perol-Schneider]

Hi Bug Squad,

This thread follows a discussion on the French forum:
http://lilypond-french-users.1298960.n2.nabble.com/Curieux-bogue-sur-un-croisement-de-portees-td7582841.html

If I slightly modify this example:
http://lilypond.org/doc/v2.19/Documentation/notation/common-notation-for-keyboards#cross_002dstaff-stems
and put the last d8 in the 'crossStaff' bloc:

\layout {
  \context {
    \PianoStaff
    \consists #Span_stem_engraver
  }
}

{
  \new PianoStaff <<
    \new Staff {
      <b d'>4 r d'16\> e'8. g8 r\!
      e'8 f' g'4 e'2
    }
    \new Staff {
      \clef bass
      \voiceOne
      \autoBeamOff
      \crossStaff { <e g>4 e, g16 a8. c8 d }
      \autoBeamOn
      g8 f g4 c2
    }
  >>
}

its flag disappears (which is normal) but LP does not give any warning
regarding this misplacement.

Cheers,
Pierre

PS. I wonder if this could be related to
https://code.google.com/p/lilypond/issues/detail?id=3025