I thought I was experiencing deja vu, but then I searched for and found this post
To correct the issue, you can insert a hidden grace note before the start repeat, tied to the note that is supposed to receive the tie from the note at the end of the repeat:
!NoteWorthyComposerClip(2.751,Single)
|Clef|Type:Treble
|Key|Signature:F#|Tonic:G
|TimeSig|Signature:4/4
|Instrument|Name:"Flute"|Patch:73|Trans:0|DynVel:10,30,45,60,75,92,108,127|Pos:8|Wide:Y
|Note|Dur:8th,Dotted,Slur|Pos:5|Opts:Stem=Down,Beam=First
|Note|Dur:16th,Slur|Pos:4|Opts:Stem=Down,Beam=End
|Note|Dur:8th,Grace|Pos:3^|Visibility:Never
|Bar|Style:MasterRepeatOpen
|Note|Dur:Half,Slur|Pos:3
|Note|Dur:4th,Dotted|Pos:1
|Note|Dur:8th,Slur|Pos:1
|Bar
|Note|Dur:8th,Slur|Pos:0|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:4th|Pos:2
|Note|Dur:8th|Pos:2
|Note|Dur:16th|Pos:3|Opts:Stem=Down,Beam=First
|Note|Dur:16th|Pos:4|Opts:Stem=Down,Beam=End
|Note|Dur:8th,Slur|Pos:5|Opts:Stem=Down,Beam=First
|Note|Dur:16th,Slur|Pos:4|Opts:Stem=Down,Beam
|Note|Dur:16th|Pos:3^|Opts:Stem=Down,Beam=End
|Bar|Style:MasterRepeatClose
|Note|Dur:Half,Slur|Pos:3
|Note|Dur:4th,Dotted|Pos:1
|Note|Dur:8th,Slur|Pos:1
|Bar
|Note|Dur:8th,Slur|Pos:0|Opts:Stem=Down,Beam=First
|Note|Dur:8th|Pos:1|Opts:Stem=Down,Beam=End
|Note|Dur:4th|Pos:2
|Note|Dur:4th|Pos:2
!NoteWorthyComposerClip-End
(Apologies to those who might not have access to the board with the referenced post.)