The "not equals" could have the same behaviour as "equals" in some cases in the advanced search. Mostly on enumerations.

I tried with :

• lastContributor : It works
• site : It doesn't work
• a linked content : It doesn't work

At line 567 of QueryBuilder, _searchCriterion._operator is equals to EQ and _searchCriterion._id is equals to property-site-eq but _op is equals to ne.