[Gelöst] The category link in my breadcrumbs points to the wrong language

Background of the issue:
I am trying to fix an issue where the category link in my breadcrumbs points to the wrong language. For example, this post is in Spanish: versteckter Link and has a Spanish category. You can see it because it shows here in the category page: versteckter Link. It is the first one on the list. The issue can be seen on this page: versteckter Link.

Symptoms:
In the breadcrumbs, I expected a link to the post category in Spanish: versteckter Link. Instead, I got a link to the English category: versteckter Link. This happens for all posts in this category.

Questions:
Why does the category link in my breadcrumbs point to the wrong language?
How can I ensure the breadcrumbs link to the correct language category?