Variation Images not shown in english product site

Dear Support,

we have a problem with variation image gallery on the english site (german as default) we copied the product, finished the WPML translation but there are only the placeholder images. I had a WPML ticket and the also disabled WPML and can see an error in die class-wc-swatch-product-term.php https://wpml.org/wp-content/uploads/2020/01/5240759-variations_1.png

can you help us?

The page I need help with: [log in to see the link]