duplicate flow isn't quite a duplicate flow

I have a flow where I’ve hidden a lot of chords, so that I can input alternate chords in another part. But when I duplicate this flow ALL the chords are visible in the new flow - so I have to hide them again. Major time consumer…
Is this by design or a flaw ?

Properties cannot be reliably copied from one flow to another, so it’s a limitation more than by design. However, you should probably be using Dorico 3’s new chord symbol regions instead of manually hiding lots of chord symbols.