The project didn't disclose who the fund manager was, or the circumstances in which the "loss" occurred.
The Staked Stream USD token depegged on November 3, and crashed further following the announcement.
Stream Finance halts activity after $93 million loss
The Stream Finance defi yield project announced that "an external fund manager overseeing Stream funds disclosed the loss of approximately $93 million in Stream fund assets." Stream announced that they were in the process of withdrawing remaining liquid assets, and had halted all deposits or withdrawals. They also announced they had retained a law firm to investigate the "incident".