We primarily use unidirectional relationships, but no, we only seem to see it with Bidirectional Relationships in testing. I've tried turning on the property because some of our Unidirectional relationships were not getting their collection caches cleared when the entity was persisting which then caused hibernate to throw EntityNotFoundExceptions because the cache still had IDs in it that had been deleted, but the cache was not updated. I've created a pull request with a fix-- https://github.com/hibernate/hibernate-orm/pull/794 . This issue wouldn't have been caught by the tests associated because they define the mappedBy parameter.
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