SAN FRANCISCO — After an arena in Washington State defaulted earlier this month, investors still got paid, but it is unclear who made the mistake.

Initially, the Washington treasurer’s office sent an e-mail to lawmakers saying that because of human error, U.S. Bank erroneously paid some holders of $42 million of notes issued by the Greater Wenatchee Regional Events Center Public Facilities District, though the district failed to make the principal payment that was scheduled Dec. 1.

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