Here’s an odd one: Dorico wants to add a measure to the end of the piece. I delete it then save. When I reopen the file, the extra measure is back.
It might be a variation on https://www.steinberg.net/forums/viewtopic.php?f=246&t=103992&p=669113&hilit=Undeletable#p669125
If you can’t figure out what’s causing the extra bar to appear, please zip up and attach the project and I’ll be pleased to sort it out for you.
Very helpful as always, Daniel. It turns out that a late dynamic tied to a rest in the final measure caused the problem. Fixed now.