In previous versions, when you applied a tie on a chord, the tie for note members did not appear if the following chord did not have that note.
In the newest versions (2.5.1 and 2.5.4) the tie for chord members does appear and remains until that note appears again.
I doubt that this feature was introduced on purpose.
!NoteWorthyComposerClip(2.5,Single)
|Clef|Type:Treble
|Instrument|Name:"String Ensemble 1"|Patch:48|Trans:0|DynVel:10,30,45,60,75,92,108,127|Pos:8
|Chord|Dur:Half|Pos:-6^,-3^,-1^
|Chord|Dur:Half|Pos:-7,-5,-2
|Chord|Dur:Half|Pos:-6,-4,-2
!NoteWorthyComposerClip-End