Stuck note after acciaccatura in Midi output

[Peter Gentry]

I have found a midi problem the e'4\fermata\f note is held on in Midi output. 

The problem vanishes if the \tempo specification changed to 179 or slower. 

I can live with setting the tempo at 179 but is this a midi bug?

Apologies if this is a known limitation.


\version "2.17.26"
\score {
    \new Staff = AStave  
     \new Voice = "C2" {  \transposition bes  
     \set Staff.midiInstrument = "clarinet"

  \relative c'' {
 \clef "treble"
 \tempo "Minuet - Allegro"4=180
 \key f\major
 \time 3/4
  d8 r8  d8\< r8  b8 r8\!   |  % 65
\acciaccatura {  es,8 }  e'4\fermata\f  es4\fermata\p  f8 [  es8 ]   |  % 66
                     }
     }
\midi {}
  }


regards
Peter Gentry