WooCommerce Custom Fields

Tom S

Klarna On-Site Messaging seems to be incompatible with WooCommerce Custom Fields. On the Single Product Page the Klarna calculator only handles the Woocommerce variations, but not the extra fields from WooCommerce Custom Fields. In the Cart the On-Site Messaging works pretty well.
I added the 'refresh-placements‘ code snippet from Klarna to the header / body of the pages, but it doesn’t help.
Is there any solution?