The tie doesn't extend to the 2nd ending (even if you change the single bar line before the first 1st ending into a double one...), unless you change it as follows:
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Key|Signature:C
|TimeSig|Signature:4/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:MasterRepeatOpen
|TimeSig|Signature:2/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:Double
|TimeSig|Signature:4/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0^
|Bar|Style:Double
|Ending|Endings:1
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar
|TimeSig|Signature:2/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:MasterRepeatClose
|Ending|Endings:2
|TimeSig|Signature:4/4|Visibility:Never
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
!NoteWorthyComposerClip-End
(Notice that you must delete the 1st ending before the time change, otherwise it doesn't work...)
Moreover, if you just try to delete the second 1st ending in my example without changing the bar line types like this:
!NoteWorthyComposerClip(2.0,Single)
|Clef|Type:Treble
|Key|Signature:C
|TimeSig|Signature:4/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:MasterRepeatOpen
|TimeSig|Signature:2/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:Double
|TimeSig|Signature:4/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0^
|Bar
|Ending|Endings:1
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:Double
|TimeSig|Signature:2/4
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Bar|Style:MasterRepeatClose
|Ending|Endings:2
|TimeSig|Signature:4/4|Visibility:Never
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
|Note|Dur:4th|Pos:0
!NoteWorthyComposerClip-End
you end having a loop !!!
So, in the end you are not "allowed" to put the double bar line [abbr=i.e. immediately before the time change]where it should be[/abbr].
Why don't you make a special ending as property of a selection, instead of property of a measure? It would be really nice, also because now it is impossible to have a 1st ending sign spanning over more than 1 measure at a time (without layering, of course...).
Thank you!