Okay, so it turns out that if one switches to Flow mode auto-population of SV's do work. It is only in Precision mode that it does not work. W 10 here.
W 10 i5-9600K 64 GB Synch - Woods, Brass, Perc I, Str Pro, Elt Str, Dua Str & Sordino, Prime Studio - Woods, Perc, Solo Str, Ch Str, Orch Str, App Str, Harps, Choir St Dim - Brass, Strings VE Pro, MIR Pro 3D, Vienna Suite Pro Cubase 14, St One 6, Dorico 5