According to this news article on the Royal Aeronautical Society website:
...an AI-enabled drone tasked with a SEAD mission to identify and destroy SAM sites, with the final go/no go given by the human. However, having been ‘reinforced’ in training that destruction of the SAM was the preferred option, the AI then decided that ‘no-go’ decisions from the human were interfering with its higher mission – killing SAMs – and then attacked the operator in the simulation.
Later, this Newsweek article seemed to report on the same event, and said that they "reached out to RAS by email for comment", but don't (yet) indicate that they received a comment either confirming or denying the story. Also, there is this Vice article which seems to describe the same event, but similar to the Newsweek article, note that "Neither the U.S. Air Force’s 96th Test Wing nor its AI Accelerator division immediately returned our request for comment."
Did this scenario happen as described?