Weird. Works now with 5.8.1, probably the previous version I had included (5.8.0) had some bugs?
The only visible difference was the Taxonomy Term menu showed the terms’ slugs instead of the titles.
All is well now!
Hello, this happens to me on 5.8.1, embedded in my theme.
If I select any taxonomy via the dropdown (Taxonomy Term is equal to) the fields disappear. If I don’t select any Taxonomy Term the fields work fine.