Github user brosander commented on the issue:
https://github.com/apache/nifi/pull/1693
@andrewmlim those images work fine for me on OSx Sierra (10.12.4) and on
Ubuntu Linux. I asked @mattyb149 to try them and he said they worked for him
on Sierra and not El Capitan.
I think we may have found an already resolved bug in the OSx png rendering
functionality. Still backed images out so that we don't cause confusion or
problems for El Capitan users.
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