Breadcrumbs for product detail pages and categories not working

[greller]

Hello

I just noticed that the breadcrumbs were behaving really weird. On some category pages it showed the breadcrumb for a specific product of a random sub-category. For specific products it would then also show the breadcrumb for a completely different breadcrumb.
I then cleared the cache to see if that would (at least temporarily) solve the issue.

Now it's different, but still wrong.
The breadcrumb entry for product detail pages is missing now, it just shows the same breadcrumb as for categories, which doesn't allow navigating to the category (as the breadcrumb thinks it's the current page).
Also it still shows completely wrong breadcrumbs for some categories.

Example: https://www.friedrich-living.de/produkte/gartenmoebel/gartentische/bistro-tische/balcony-bistrotische-detail

Does anyone have an idea what might cause this? I didn't change anything on the page afaik.