Github user JPercivall commented on the issue:
https://github.com/apache/nifi/pull/757
Sorry for not noticing this earlier but it appears that encapsulated
components (processors, controller services, etc.) inside a process group that
gets deleted do not have their associated policies deleted too.
Also I believe there is a small oversight with the UI in regards to CS and
RT, when you have "write" but not "view" the button for deleting a CS or RT
does not appear. Probably a super simple fix if you wanted to add it.
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