When you create a content selector privilege you need to enter the actions as a comma separated list. If you put spaces between the items in the list it breaks the privilege, retrieving it through the privileges rest API will not show all actions. Additionally, no validation is done of the strings entered to make sure the actions are valid.
Expected: Only valid entries should be allowed. If spaces are not supported, they should not be allowed. If they are supported they should work properly.
Even better... provide checkboxes for the valid options, and don't use free form text entry, so it will be obvious what is supported and invalid entries will be impossible