Portamento at the end of a tied chord

This snippet from my Lilypond work - how can it be achieved in Dorico? Dorico seems to insist on starting the portamento at the first chord of the tie, and adjusting the ‘delayed start’ value has no effect in my project.


Try putting the second noet of each tie in a different voice and then tying by click - CTRL/CMD+clicking the notes to be tied.

That doesn’t sound right - Dorico automatically starts glissando lines from the last note in tie chains usually. Are they definitely tied, not slurred?