I just added a string section to a piano project and when I tried writing something, no articulations, techniques, etc. worked for the Iconica strings. I checked and found that I’m missing all the HSO & Iconic expression maps.
I did reinstalls of Dorico, Iconica and still nothing.
It does happen from time to time (at least, previously) presumably sometimes when adding more players/instruments, but perhaps the Auto setting is designed to take care of this in a better way, otherwise reapplying it is the first step to try.