Thanks! I tried it just now and the same happens for me, both in galley view and condensed. There are tuplet rests for the Bassoon 1 part, but all the notes have disappeared, only for the first flow as far as I can tell.
I’m also noticing some problems with vertical spacing in some of the other movements here as well, and some weird balances in playback. It’s entirely possible that I had some screwy things in the file - tons of manual vertical spacing adjustments, bracketing, etc., to try and match the published version.
In Dorico 3.5 it still all looks OK.
Weirdly, just today I had Part Two open, and it seems to work fine in Dorico 4: spacing all looks the same as far as I can tell, and playback sounds decent - the trumpets seem a little softer maybe than in 3.5. Hmmmm! I did input Part Two after finishing Part One, and maybe my Dorico chops improved in the meantime, although it still has lots of manual adjustments for vertical spacing, brackets, etc. I’ll try to fix Part One, and see if it works in both Dorico 4 and 3.5.