Undo WooCommerce tab removal

undo_tab_removal.php

<?php
/**
 * @param string $tab
 * @param int $offendingPriority
 */
function my_prefix_undoTabRemoval($tab, $offendingPriority = 10)
{
    static $filterName = 'woocommerce_product_tabs';

    // Accessible variable for the tab content.
    $tabContents = null;

    add_filter($filterName, function ($tabs) use ($tab, &$tabContents) {
        // Safely store the tab content (if available).
        $tabContents = $tabs[$tab] ?? null;

        return $tabs;
    }, $offendingPriority - 1);

    add_filter($filterName, function ($tabs) use ($tab, &$tabContents) {
        if (null !== $tabContents && ! isset($tabs[$tab])) {
            // Restore the tab.
            $tabs[$tab] = $tabContents;
        }

        return $tabs;
    }, $offendingPriority + 1);
}

add_action('init', function () {
    my_prefix_undoTabRemoval('additional_information');
});