WPML not 100% compatible

Hi,
according the sitemap Plugin and WPML compatibility:
Everywhere you wrote, that it is compatible, but I cannot confirm it to 100%.
As you see at that site, and ai Have some other websites with the same problem:
All pages are included in the sitemap with a small error:
https://www.domain.com/kontakt (for german)
https://www.domain.com/contact (for english)

but it should be
https://www.domain.com/en/contact (for english)

or is there a setting in WMPL/your sitemap Plugin to correct this?

both plugin the newest version

https://www.ads-software.com/plugins/xml-sitemap-feed/