https://demo.bamboohr.com/login.php?r=/home/ works by first having a form to log in, and then a special custom UI on the following page for a TOTP code. In 1Password 8, the field won't autofill at all.
The thing is, I'm not sure if it was autofilling in 1Password 7, or if I just had muscle memory to paste in the 2FA code. So either:
1Password Version: 8.9.8
Extension Version: 2.4.1
OS Version: macOS 13.0