I have the same Problem but not the Quote Plugin.
Fatal error: Uncaught ArgumentCountError: Too few arguments to function WC_GZD_Emails::add_bcc_email_headers(), 3 passed in /var/www/html/shop_org/wp-includes/class-wp-hook.php on line 286 and exactly 4 expected in /var/www/html/shop_org/wp-content/plugins/woocommerce-germanized/includes/class-wc-gzd-emails.php:153 Stack trace: #0 /var/www/html/shop_org/wp-includes/class-wp-hook.php(286): WC_GZD_Emails->add_bcc_email_headers(”, ‘backorder’, Array) #1 /var/www/html/shop_org/wp-includes/plugin.php(203): WP_Hook->apply_filters(”, Array) #2 /var/www/html/shop_org/wp-content/plugins/woocommerce/includes/class-wc-emails.php(681): apply_filters(‘woocommerce_ema…’, ”, ‘backorder’, Array) #3 /var/www/html/shop_org/wp-includes/class-wp-hook.php(286): WC_Emails->backorder(Array) #4 /var/www/html/shop_org/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array) #5 /var/www/html/shop in /var/www/html/shop_org/wp-content/plugins/woocommerce-germanized/includes/class-wc-gzd-emails.php on line 153
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