Noticed some funky behaviour when changing my Nextdoor email address (https://ca.nextdoor.com/settings/account/ )
After typing in the new address and hitting save, the site prompted me for my password in a modal dialog. I tried to use autofill but that also changed the underlying email address back to the old one in the background. Instead, I had to paste my password in order to preserve the email field.
This is very much an edge case, but just wanted to make sure you're aware in case it's a quick fix.
1Password Version: 7.6
Extension Version: 220.127.116.11
OS Version: 10.15.6
Sync Type: 1Password