Yes, it should work without any errors with PHP8+. Could you please disable all plugins that are not related to our theme and provide us your admin access so we can check it?
unfortunately I cannot deactivate all plugins that are not related to Basel theme because the website is live. It is online for some time now and has been using a license from an agency that does not exist anymore so we bought a new license.
I now deactivated as much plugins as possible. Can I take a look please?