Can you provide the raw GEDCOM data for the family of Leo Hanau and Stella Bloch (F445) ?
The phrase “partners partner” suggest that F445 does NOT have a valid marriage event (1 MARR Y). This is also what I see when viewing that family as a visitor, but you have said it does, and that it also has a source and text. So there must be another problem.
That might be caused by the fact that their son is still living and therefore marked “private” – making the marriage also hidden. But there might be something else in the family GEDCOM data causing a problem (i.e. a bug).
This is also somewhat similar to the issues that raised the question of the visitor vs member access rules, which need fixing.