The query looks like:

SELECT * FROM [nt:base] AS t WHERE ((lower(LOCALNAME()) LIKE '%hiddenapps%' AND ISDESCENDANTNODE('/modules/multisite/config/sites')) AND (t.[jcr:primaryType] = 'mgnl:content' OR t.[jcr:primaryType] = 'mgnl:contentNode') OR CONTAINS(t., '*hiddenapps'))

Whereas it should be rather:

SELECT * FROM [nt:base] AS t WHERE (((lower(LOCALNAME()) LIKE '%hiddena%' OR CONTAINS(t., '*hiddenapps')) AND ISDESCENDANTNODE('/modules/multisite/config/sites')) AND (t.[jcr:primaryType] = 'mgnl:content' OR t.[jcr:primaryType] = 'mgnl:contentNode'))