Github user JPercivall commented on the issue:
https://github.com/apache/nifi/pull/698
One thing I did notice is when I have selected just GenerateFF I can move
it (UI properly moves relationship too) but if I have GenerateFF and connection
selected it fails (message "Must be authorized to modify every component
selected."). I believe this is because it is checking if I have permission to
move the connection which in turn checks if I have permission to modify the
destination (which I don't).
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