probably
Transpose +8 plays back the same as shifting the notes up 7 lines. But this only works with octave transpositions.
Possibly this clip shows the problem:!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Note|Dur:8th|Pos:-6|Opts:Stem=Up,Beam=First
|Note|Dur:8th|Pos:-5|Opts:Stem=Up,Beam
|Note|Dur:8th|Pos:-4|Opts:Stem=Up,Beam
|Note|Dur:8th|Pos:-3|Opts:Stem=Up,Beam=End
|Clef|Type:Alto
|Note|Dur:8th|Pos:0|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:8th|Pos:2|Opts:Stem=Down,Beam
|Note|Dur:8th|Pos:3|Opts:Stem=Down,Beam=End
|Bar
|Clef|Type:Treble|Visibility:Never
|Instrument|Name:"[-11]"|Trans:-11|Pos:9|Placement:AtNextNote|Visibility:Never
|Note|Dur:8th|Pos:0|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam|Color:1
|Note|Dur:8th|Pos:2|Opts:Stem=Down,Beam|Color:1
|Note|Dur:8th|Pos:3|Opts:Stem=Down,Beam=End
|Chord|Dur:Whole,Grace|Pos:#1z,#2z|Opts:Muted|Visibility:Never
|Note|Dur:8th|Pos:0|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam
|Note|Dur:8th|Pos:2|Opts:Stem=Down,Beam
|Note|Dur:8th|Pos:3|Opts:Stem=Down,Beam=End
!NoteWorthyComposerClip-End
In any case, NWC2 handles Clef changes badly. Clefs that appear mid-line are usually placed so as to disrupt the flow of the song as little as possible. You need the control of horizontal position, size and width that is only possible with text clefs.
A fix would be for the Clef at the start of each system to inherit its visibility from the very first Clef on its staff and ignore the visibility setting of "inline" Clefs. But this would be confusing to new users.