I would like to export the field “is_blacklisted” on contact (Boolean) in a mass action in order to change it in Excel and import it again. If I do not select the option “I want to update data (import-compatible export)” during export, I get the field. However, if I select it, this field disappears from the selection list. I could certainly do something in Excel with several exports and imports - but is there a simpler solution? Is there any reason for this behaviour?