When Chrome starts (and when 1Password restarts after an update and Chrome is already running), a notification appears telling me that standalone vaults aren't supported.
If I had to guess, I would guess that it has something to do with the fact that I have multiple Chrome profiles open. All but one of these profiles use the desktop app and accompanying extension, but one profile uses 1Password X. Not sure if you've tested this scenario; if you have, maybe you can tell me whether I'm on the right track and, more important, how I can make the notification go away.
1Password Version: 7.3 b10 (70300010)
Extension Version: 126.96.36.199 (X ver. 1.15.8)
OS Version: macOS 10.14.5 beta 2
Sync Type: iCloud+Dropbox