Kyle -
ref this report:
www.joomlapolis.com/forum/professional-members-support/245282-update-to-php-8-1#331256
I'm getting the same deprecation warnings after upgrading to J4 from 3.10 - the CB version was the latest 2.7.4+build.2022.12.07.19.10.12.f06961ef4
All from the same file - \libraries\CBLib\CBLib\DependencyInjection\Container.phpDeprecated: Return type of CBLib\DependencyInjection\Container::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in

\www\fig\libraries\CBLib\CBLib\DependencyInjection\Container.php on line
894Call Stack
To help testing, I installed a new J4 (not an upgrade) and a fresh not-upgraded CB & CBSubs and turned on Max errors - no warnings.
So, the CB extension upgrade process somehow missed the new Container.php file.
Suggestions on a fix?
Thanks,
Fred