My bad, checked the script and it's actually based on your Ep17 Raene choice, not Ziv (there was some dialogue based on your Ziv bottom choice that popped up as a conditional in URM which must have thrown off my memory). In either case, you don't get a new choice for it in Ep21.Raene asks you separately. If that happens regardless of that choice it then it's a bug and should be reported as such.
Note that this doesn't bother me, just pointing it out.