When a taxonomy filter is used, the count filter that taxonomy item. Items from the own taxonomy should be excluded, to allow multi select.
The bug applies to: Channels, Workflow state, Taxonomy filters, maybe more
The bug DOES NOT apply to: Content types (so it seems the exclude is only added for this one)
Note : the customer encounters problems with this issue at a daily frequency. I promised to notate that this issue is a high prio issue for the customer.