After updating to 3.5.1 it seems some labels on condensed staves have disappeared - there’s a blank second trombone stave which should read Kbpos (bass trombone) - definitely worked fine in 3.5.
I’ll upload a project file if you think it’ll be useful (but will take an hour or two to trim down the project - takes 2-3mins just switching between write and engrave mode!). I notice a couple of improvements in the changelog for condensed staff labelling so maybe this is by design and there’s a setting I need to now update?
EDIT: Oh, I should add that this is a custom condensing group - Dorico doesn’t group trombones and bass trombone by default obvs.