On desktop, it is release version 0.35.4. All relations of type tag are locked.
On iOS, it is the testflight version (is there another one?) 0.25.1 (1) For this version, not only are the relations locked, but the sets only show the objects created after this bug appeared, and says “Deleted type.” All the objects in the set that existed before the bug appeared are gone:
However, the type is not actually deleted. I can create new objects with it (and they show up in the set).