magento2 – Breadcrumbs not showing category on product page

I do have a question regarding breadcrumbs in Magento 2.3.5.

I do have some categories which are not shown in the menu. Meaning I disabled them for the category menu. This is necessary in my layout because of not enough place to display.
I do access these categories with other links.
So far so good, but in this case breadcrumbs are only showing the productname on the product page and not the category names.

Does somebody have an idea how to change this?