Core compatibility

The plugin page shows the message “This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.”

This is because it’s specific as being tested up to WordPress 5.2.7.

This is likely to prevent people from installing the plugin on new sites, and possibly from trusting its updates, and, assuming it’s compatible up to WP 5.5, is trivial to fix.