Issue with Dorico 2 file in Dorico 3

When I open a file from Dorico 2 in Dorico 3 I get a message that some fonts are missing on the computer. And the file opens with bravura instead of Petaluma. When I open the same file in Dorico 2 on the same computer everything is as it should. Any ideas?
Bildschirmfoto 2019-09-06 um (134 KB)

Does this affect every project, or just one? If it affects just one, can you attach it here?