Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/718
@olegz all looks good except that I did run into one issue. I created a
Process Group. In the group, I added an InputPort -> LogAttribute ->
OutputPort. I then copied & pasted it. All worked okay. I then selected both of
them and created a template. When I tried to instantiate the template, I got
the following error: An Input Port already exists with ID
3745b139-0156-1000-a6c2-7a3b88ed2c91
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