MultilingualPress - Copy SKU & Price to Product Data tab in the metabox for the remote product(s)

functions.php

<?php
use Inpsyde\MultilingualPress\TranslationUi\Post\RelationshipContext;

add_action('multilingualpress.metabox_after_update_remote_product',
    static function(RelationshipContext $context, WC_Product $remoteProduct, WC_Product $sourceProduct) {
        $remoteSku = $remoteProduct->get_sku() ?? '';
        $remotePrice = $remoteProduct->get_price() ?? '';

        if (!empty($remoteSku) && !empty($remotePrice)) {
            return;
        }

        $sourceSiteId = $context->sourceSiteId();

        switch_to_blog($sourceSiteId);

        $sourceSku = $sourceProduct->get_sku() ?? '';
        $sourcePrice = $sourceProduct->get_price() ?? '';

        restore_current_blog();

        $remoteProduct->set_price($sourcePrice);
        $remoteProduct->set_sku($sourceSku);
    },
    10,
    4
);