I converted a text field to an email field and found that I could not use the csv import wizard to update it.
Turns out I couldn’t create an email field using the Wizard either.
I settled for converting my email field back to text and had no issues.
Thanks for the report, looks like a bug, will fix 
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I’m now seeing this error when trying to import phone numbers as well.
I previous had no issue importing phone numbers.
