Такая же проблема. Query Monitor показывает ошибки PHP.
Предупреждения: Invalid argument supplied for foreach()
wp-content/plugins/wp-super-cache/wp-cache.php:2050
wp_cache_edit_rejected_cookies()
wp-content/plugins/wp-super-cache/wp-cache.php:1199
wp_cache_manager()
wp-includes/class-wp-hook.php:307
do_action('settings_page_wpsupercache')
wp-admin/admin.php:259
WP 5.9 и PHP 7.4.x
This has been fixed in the latest release out today.
Да Спасибо!
Но теперь появилась вот такое уведомление от Query Monitor:
Уведомления Undefined variable: wp_cache_mobile_prefixes 1
wp-content/plugins/wp-super-cache/partials/advanced.php:72
wpsc_render_partial()
wp-content/plugins/wp-super-cache/wp-cache.php:1055
wp_cache_manager()
wp-includes/class-wp-hook.php:307
do_action('settings_page_wpsupercache')
wp-admin/admin.php:259
Плагин: wp-super-cache
Thanks for reporting that.
Grab the development version of the plugin from http://odd.blog/y/2o and install it if you’d like a fix for this.
Or make the same change I did to wp-cache.php here: https://github.com/Automattic/wp-super-cache/pull/803/files