Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2914
In case any reviewer comes along and wonders why it wouldn't be simpler to
just control the EL logic and input data better, the reason why is that the
folks in our company who reported this error to me and @dmkoster are working
with another team that is driving this with their own input. So their only
choices in this multiple-chefs-in-the-kitchen situation are to either add
manual steps to clean it up or watch the data back up in the queue.
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