After upgrading to 1.18.6, the chrome extension lost it's connection to the desktop app and cannot reestablish. I haven't changed anything with the extension or the app. The only other possible culprit could be that OS X upgraded recently.
1Password Version: 7.4.2 (70402004)
Extension Version: 1.18.6
OS Version: OS X 10.15.3
Sync Type: Web