It’s still not working, but I found workaround, You can add to functions.php this kind of code:
add_filter( ‘woocommerce_get_image_size_single’, function( $size ) {
return array(
‘width’ => 600,
‘height’ => 900,
‘crop’ => 1,
);

And it will crop to proportions You want, try this kunststofplatendepot.nl