WordPress 5.6 breaks plugin

I’m having the same issue 🙁

You could update options.js with this code to fix the plugin:

jQuery(document).ready(function ($) {
    $(this).on('change', '.custom_field, .custom_textarea, input.qty', function () {
        $(this).trigger('show_options_final_total');
    });

        $(this).trigger('show_options_final_total');

    jQuery(document).on('found_variation', 'form.cart', function (event, variation) {
        var $variation_form = $(this);

        var $totals = $variation_form.find('#product-options-var-total');

        if ($(variation.price_html).find('.amount:last').size()) {
            product_price = $(variation.price_html).find('.amount:last').text();
            product_price = product_price.replace(woocommerce_custom_var_options_params.thousand_separator, '');
            product_price = product_price.replace(woocommerce_custom_var_options_params.decimal_separator, '.');
            product_price = product_price.replace(/[^0-9\.]/g, '');
            product_price = parseFloat(product_price);

            $totals.data('product-price', product_price);
        }

        $variation_form.trigger('show_options_final_total');
    });

    $(this).on('show_options_final_total', function () {

        var option_total = 0;

        var product_price = $(this).find('#product-options-var-total').data('product-price');

        if (typeof product_price == 'undefined') {
            var product_price = $('#product-options-var-total').attr('product-price');
        }

        product_price = parseFloat(product_price);

        var product_total_price = 0;

        var final_total = 0;

        $('.custom-variation').each(function () {

            var option_price = 0;

            option_price = $(this).attr('data-price');
            var value_entered = $(this).val();

            if (value_entered != '' || option_price == 0) {
                option_total = parseFloat(option_total) + parseFloat(option_price);
            }

        });

        var qty = $('.qty').val();

        if (option_total > 0 && qty > 0) {

            option_total = option_total * qty;

            option_total = option_total.toFixed(2);

            option_total = parseFloat(option_total);

            //console.log( product_price );

            if (product_price) {

                product_total_price = product_price * qty;

                product_total_price = product_total_price.toFixed(2);

                product_total_price = parseFloat(product_total_price);

            }

            final_total = option_total + product_total_price;

            final_total = final_total.toFixed(2);

            html = '';

            if (woocommerce_custom_var_options_params.show_op == 1) {
                html = html + '<dl class="product-options-price"><dt> ' + woocommerce_custom_var_options_params.op_show + ' </dt><dd><strong><span class="amount">' + woocommerce_custom_var_options_params.currency_symbol + option_total + '</span></strong></dd>';
            }

            if (final_total) {

                if (woocommerce_custom_var_options_params.show_ft == 1) {
                    html = html + '<dt>' + woocommerce_custom_var_options_params.ft_show + '</dt><dd><strong><span class="amount">' + woocommerce_custom_var_options_params.currency_symbol + final_total + '</span></strong></dd>';
                }

            }

            html = html + '</dl>';

            $('#product-options-var-total').html(html);

        } else {

            $('#product-options-var-total').html('');
        }

    });

    $(this).find('.variations select').change();

	var variation_id = '';
	jQuery(document).on('found_variation', 'form.cart', function (event, variation) {
		main_col();
	});
	jQuery('.variations select').on('ready change', function () {
		jQuery(document).on('found_variation', 'form.cart', function (event, variation) {
			main_col();
		});
		jQuery("body").on('click', '.reset_variations', function () {
			main_col();
		});
	});

    function main_col() {

        $('#product-options-var-total').html('');
        variation_id = jQuery(".variation_id").val();

        // alert(variation_id);

        if (variation_id !== '' && variation_id !== undefined && variation_id !== 0) {
            jQuery('.phoen_minss').each(function () {
                jQuery(this).find('input').val('');
                jQuery(this).find('textarea').val('');

                if (jQuery(this).hasClass('phoenwwe_' + variation_id)) {
                    jQuery(this).css('display', 'block');
                } else {
                    jQuery(this).css('display', 'none');
                }
            });
        } else {
            jQuery('.phoen_minss').each(function () {
                jQuery(this).find('input').val('');
                jQuery(this).find('textarea').val('');

                jQuery(this).css('display', 'none');

            });
        }
    }

});