1P struggling with TaxSlayerPro login page

When I use 1P https://vita.taxslayerpro.com/ProAvalon, 1P fills in my credentials, but the "Login" button stays greyed out.

The only workaround is to manually delete the password entry and then use the 1P drop down that appears to fill in the password, and then all is well (1P enters the password and automatically submits, as expected).

This is new behavior as of a month or so ago. For 4-5 years prior, things worked perfectly. This, of course, suggest that there is an issue with the site, not directly with 1P, but I know 1P likes to hear about sites where it doesn't work perfectly.

1Password Version: 8.10.50
Extension Version: 8.10.50.25
OS Version: MacOS 14.7
Browser: Brave/Chrome