for a long time now (always using the latest version of 1P and iOS (not-beta) when I use use autofill, I get a yellow background when it fills, and unless I go to each entry, backspace once, and replace the last character, whereupon the background changes from yellow to white, it considers the entry invalid.
1Password Version: 7.3.3 (and prior)
Extension Version: Not Provided
OS Version: iOS 12.3.1 (and prior)
Sync Type: iCloud
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