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This happens with these settings:
report_unknown => 1,
ignore_unknown => 1,
I create a field foo and give it an alias bar. When I validate the data, and pass in a value for bar, I get this error:
Data validation field bar does not exist
This was not happening back in 7.86. I found this issue after upgrading to the latest version, 7.900044.
Fixed in release 7.900045