#1 WordPress 6.1 adds new method call wpdb->db_server_info() in dbDelta @ andreasnrb

    /**
     * Retrieves full database server information.
     *
     * @since 5.5.0
     *
     * @return string|false Server info on success, false on failure.
     */
    public function db_server_info() {
        return 'somestring';
    }

The SQLite drop in is missing the implementation of function db_server_info() {}. /** * Retrieves full database server information. * * @since 5.5.0 * * @return string|false Server info on success, false on failure. */ public function db_server_info() { return 'somestring'; }