Although the general verdict form erroneously indicated that a finding of not guilty would also be subject to the qualification that it had been found beyond a reasonable doubt, the defendant's rights were not substantially prejudiced, given the instructions at trial.
http://cdn.ca9.uscourts.gov/datastore/opinions/2018/06/18/16-50344.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.