php - WooCommerce checkout endless loading with empty AJAX response

I am adding a WooCommerce based shop to my page and I've run into issue with endless loading in checkout. Having read some, things I've already done were: disabling caching (normally using W3TC), disabling plugins that were flagged by WooCommerce status as "not tested with current version". To try locating issues I enabledWP_DEBUG and set

if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || ( defined( 'WP_INSTALLING' ) && WP_INSTALLING ) || wp_doing_ajax() ) {
        @ini_set( 'display_errors', 1 );
    }
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inwp_debug_mode() ofwp-includes/load.php. This did not help at all, since the response for?wc-ajax=update_order_review is empty either way (but with status 200), and there is nothing related in debug.log. How should I look for what causes the response to be empty?

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