Did you get this music into Dorico by
a) step-entry within Dorico?
b) real-time MIDI entry within Dorico?
c) MIDI import from other software?
d) MusicXML import from other software?
- Why not just use an actual trill?
- Is it possible that the sample just isn’t speaking quickly enough? If so, you might be able to adjust the attack of that sample, depending on which sample library you’re using.
- Turn on View > Note and Rest Colors > Voice Colors and take that screenshot again (the one with the rests).