Hi,
in the meantime i found a solution, which works for the moment:

	function avia_woocommerce_gallery_thumbnail_description($img, $attachment_id, $post_id, $image_class ) {
	    return $img;
	}
	function avia_woocommerce_post_thumbnail_description($img, $post_id){
	    return $img;
	}

function gallery_title_fix(){
?>
<script>
(function($){
    $(window).load(function() {
    	$('.woocommerce-product-gallery__wrapper img').each(function(){
            var caption = $(this).attr('data-caption');
            $(this).attr('title',caption);
        });
    });
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'gallery_title_fix');

Kind regards!

Hi,
alles klar. URL im privaten Bereich eingefügt.
Danke und viel Grüße!