This is just an observation/possible bug report, though not an urgent problem as it’s easy to solve.
I opened a Dorico 2.2 file in Dorico 3. It looked perfectly normal. Saved it, so it was now automatically converted to D3 format.
Later opened the new D3 version & noticed in the harp part some notes were randomly turned red. This was nothing to to do with voices or being out of range for the instrument or being accidentals or anything obvious. Easily cured by selecting all the notes & changing the colour back to black (though some tied notes had to be untied first), but I’m not sure why it happened.
Otherwise… love D3. My personal wish list is for a) adding control over fermata playback length to the bottom panel and b) implementing smooth glissandi in playback. I’m sure these are in the pipeline in due course.