\score {
     \new Staff \with {
           printPartCombineTexts = ##f
           midiInstrument = "bassoon"
           instrumentName = "Bassoon"
           shortInstrumentName = "Bass."
        } << \partcombine \bassoonOne \bassoonTwo >>
  }

This solution seems to work great.
I think that the strange behaviour of \partCombine is related to \grace notes
Here is a little example :

%%%%
partA = \relative { \grace { fis8 } g1 }
partB = \relative { \grace { dis8 } e1 }

\score { 
 <<
    \new Staff { 
        %% here it's work
        \partcombine \partA \partB
 
     }
    \new Staff { 
        %% here it's doesn't work
        \set Staff.instrumentName = "bassoon" 
        \partcombine \partA \partB
    }
 >>
}
%%%%%

Gilles
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