The “Wikidata property example” property twists the data model around so much that it almost always results in some kind of constraint violation. Let’s just hard-code that one property to skip constraint checks on it and be done with it. There’s no need to configure this via any “exception to constraint” mechanism or the like on Wikidata.
(Where “hard-code” means a config variable, of course, not literal hard-coding. And we might as well make it an array instead of a single property ID. But that’s just details.)