BlockBeats News, March 26th, Polymarket announced on its official Discord that it has identified issues regarding the "Ukraine Rare Earth Market" prediction event. The resolution of this market violated the expectations of Polymarket users. Polymarket stated that as this was not a market failure, refunds will not be issued.
At the same time, Polymarket and the UMA team have negotiated to establish systems, monitoring, etc., to ensure that this situation will not happen again.
According to previous community messages, a user manipulated the outcome of the "Ukraine Rare Earth Market" prediction event on Polymarket by hijacking the UMA oracle.