Login redirect user to the previous URL in WooCommerce on your child site.
Snippet Type
Execute on Child Sites
Snippet
add_action( 'woocommerce_login_form_end', 'wc_actual_referrer' );
function wc_actual_referrer() {
if ( ! wc_get_raw_referer() ) return;
echo '<input type="hidden" name="redirect" value="' . wp_validate_redirect( wc_get_raw_referer(), wc_get_page_permalink( 'myaccount' ) ) . '" />';
}