"Bonus caches must be Mystery Caches" was a rule prior to the implementation of the bonus cache attribute.  The attribute, which is only available for the Mystery Cache type, merely reflected that existing rule.  For those cache owners and reviewers who were not following the "bonus cache must be a Mystery Cache" rule, the introduction of the attribute may have brought that disconnect to light.   The "bonus cache must be a Mystery Cache" rule trumps, in order of priority, several other
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