I made an exposed "grouped fitler" based on the content types to hide some of the content types in the dropdown.
When I look at the sql query I see this in the where clause

WHERE (( (users_pwg_claim.uid = '1' ) )AND(( (node_pwg_claim.type IN ('organisatie', '0', '0', '0', '0', '0', '0', '0', '0')) )))

For some reason reason (probably missing array_filter), the NOT selected content types are added to the query with a '0' value. The query works but I'ts not particular clean...