PHP Fatal error: Class ‘WP_Widget_Block’ not found in

  • Experiencing the following error on a couple of sites

    [30-Jul-2021 17:18:37 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘wp_enable_block_templates’ not found or invalid function name in /home/username/public_html/wp/wp-includes/class-wp-hook.php on line 303
    [30-Jul-2021 17:18:37 UTC] PHP Fatal error: Class ‘WP_Widget_Block’ not found in /home/username/public_html/wp/wp-includes/class-wp-widget-factory.php on line 61

    Have pulled a backup from prior to update, turned off auto update within cpanel control panel and adjusted wpconfig file to NOT auto update but every time we restore the backup the autoupdate occurs almost immediately

    Also have already tried disabling all plugins as well….

    Any suggestions on resolving?

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