I've had a few times (https://client.joistapp.com/invoices for one) where I have 1PX autofill the CC information, and the CCEXP field on the site is 2 char / 2 Char, and the YY winds up being 20, instead of 22.
1Password Version: 1Password 7 Version 7.4.BETA-0 (70400000) 1Passwor
Extension Version: 1.17.2
OS Version: macOS 10.15.1 (Catalina)
Sync Type: 1P Account