“Select options” button URL parameter causes 404

The problem was mentioned here before and it seems to have been solved, but here it is again. ??

The “Select Options” button in our product list will get “&quantity=1” added to the URL when Min/Max is set and that causes 404 on our site.

The product is a simple product.

We are using WPML and I also realized that when I use another language than the main site language, the “Select options” button will not get that problematic URL parameter. Could we just get rid of it?

Min/Max parameters are working fine with the translated versions of the product.