Github user rstjohn commented on the issue:
https://github.com/apache/nifi/pull/1334
Great job debugging the issue. It was, in fact, what you suspected: a
caching issue. I was able to remedy the UI by extracting the template iframe
into a separate tab. Then, I cleared the cache and did a hard refresh. After
that the delete button was visible. Lastly, I refreshed the NiFi canvas and
viewed the templates inside the iFrame and the delete button was visible.
Thanks for taking the time to get this resolved.
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