I've noticed this issue more and more lately. I will create a new login say on my PC and when I go to log into that site say on a mobile device using the extension it cannot find the login. I have to actually open the 1password app first then switch back to my browser, open the extension and only then will it find the login.
Seems like the iOS share sheet extension doesn't trigger an update of the vault.
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided