Not sure if this is a bug or not.
Here, there's a hanging note from F at the end of bar 2 tied to F at the F beginning of bar 3, caused by the accidental Fb an octave higher on a grace note in bar 2. This passage is treble clef, in the key of Bb major.
I think this is unintended behaviour. If I recall an earlier discussion of accidentals, the lower F should not have been affected by the accidental an octave up.
!NoteWorthyComposerClip(2.0,Single)
|Note|Dur:8th,Triplet=First|Pos:b2|Opts:Stem=Down,Beam=First
|Note|Dur:8th,Triplet|Pos:0|Opts:Stem=Down,Beam
|Note|Dur:8th,Triplet=End|Pos:2|Opts:Stem=Down,Beam=End
|Note|Dur:8th,Triplet=First|Pos:3|Opts:Stem=Down,Beam=First
|Note|Dur:8th,Triplet|Pos:2|Opts:Stem=Down,Beam
|Note|Dur:8th,Triplet=End|Pos:3|Opts:Stem=Down,Beam=End
|Note|Dur:8th,Triplet=First|Pos:b4|Opts:Stem=Down,Beam=First
|Note|Dur:8th,Triplet|Pos:3|Opts:Stem=Down,Beam
|Note|Dur:8th,Triplet=End|Pos:2|Opts:Stem=Down,Beam=End
|Note|Dur:8th|Pos:0|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:7^|Opts:Stem=Down,Beam=End
|Bar
|Note|Dur:4th|Pos:7
|Note|Dur:32nd,Grace,Slur|Pos:b4|Opts:Stem=Up,Beam=First
|Note|Dur:32nd,Grace,Slur|Pos:3|Opts:Stem=Up,Beam=End
|Note|Dur:8th|Pos:b2|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:0^|Opts:Stem=Down,Beam=End
|Note|Dur:4th|Pos:0
|Note|Dur:8th|Pos:n2|Opts:Stem=Up,Beam=First
|Note|Dur:8th|Pos:-3^|Opts:Stem=Up,Beam=End
|Bar
|Note|Dur:4th|Pos:-3
|Note|Dur:8th|Pos:-2|Opts:Stem=Up,Beam=First
|Note|Dur:8th|Pos:0|Opts:Stem=Up,Beam=End
|Note|Dur:4th|Pos:0
|Note|Dur:8th|Pos:2|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:4^|Opts:Stem=Down,Beam=End
|Bar
|Note|Dur:4th|Pos:4
!NoteWorthyComposerClip-End
I could be misremembering, but I thought I'd bring it to NWC's attention in case it needs to be fixed. Meanwhile, I'll just enter a natural sign to correct it.
Hmm, it would be nice if it was possible to hide the natural sign...