Trill playback w specific interval indicated

I am using Dorico with some older VSL VI libraries. I’ve got my expression map set up correctly for 1/2 and whole-step trills. I’m noticing, however, that when I specific an interval type in the trill, it doesn’t work (i.e. it just stays on whatever the previous articulation was). If I remove the interval, the trill plays (both 1/2 and whole, depending on key sig). Is there a fix for this - I’d really like to indicate the interval and get correct playback! (I’m changing articulations with keyswitches)