does this Slur handling look like a bug to anyone else?

[Kieren MacMillan]

Hi all,

%%%  SNIPPET BEGINS
\version "2.25.11"

\layout {
  \context {
    \Score
    \override PaperColumn.show-horizontal-skylines = ##t
    \override Accidental.show-horizontal-skylines = ##t
    \override NoteHead.show-horizontal-skylines = ##t
    \override NoteColumn.show-horizontal-skylines = ##t
    \override Slur.show-horizontal-skylines = ##t
    \override NonMusicalPaperColumn.show-horizontal-skylines = ##t
  }
}

{ \tupletUp \times 2/3 { f''8[( d''8]) bes'8 } }

{ \key f \major \tupletUp \times 2/3 { f''8[( d''8]) bes'8 } }
%%%  SNIPPET ENDS

Why would the Slur be positioned differently in these two cases? If anything 
[i.e., thinking of collisions / skylines], I would have thought the Slur would 
be pushed up [by the Accidental] in the *second* example, not the first! And 
looking at the skylines, I don’t see any reason for a difference anyway.

Thanks,
Kieren.
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