WordPress 6.0+ and PHP 8.0+ compatibility requires plugin V5. (V4 is unsupported in this configuration.)

[evansims]

With WordPress 6.0 around the corner, Automattic is preparing to begin limited support of PHP 8.0+ with the platform.

However, due to an incompatibility in one of the sub-dependencies our plugin relies on, our WordPress plugin may not be fully compatible with PHP 8.0+ at this time. For the moment, we strongly recommend running the plugin with WordPress using only PHP 7.4 to avoid issues.

We have updates planned for this plugin to bring full PHP 8.0 compatibility later this year.

[evansims]

WordPress 6.0+ and PHP 8.0+ support are now available in the new 5.X WordPress version release.