When you upgrade to B3, the the toolbar app won't open unless you open the main application and only close it by window's close button. If you do a complete quit (Command-Q) the toolbar app won't open at all.
You have to restart the machine to get things to work properly. And then, when in Desktop, the toolbar app opens to Suggestions rather than "all passwords" and only shows that when you open in a window other than being in Desktop. Was this done deliberately? I never saw that happen before.
1Password Version: 7.6B3
Extension Version: Not Provided
OS Version: OS X 10.15.5 Catalina
Sync Type: iCloud