Ethereum consensus client Prysm has released a post-mortem report on the December 4 Fusaka mainnet incident, identifying resource exhaustion due to costly state recomputation as the cause of the outage. This issue resulted in 41 missed epochs, a drop in network participation to 75%, and validator reward losses totaling approximately 382 ETH. To address the problem, Prysm applied a temporary fix using a runtime flag and has since implemented permanent changes to the attestation validation logic in its software versions v7.0.1 and v7.1.0. These updates aim to prevent similar incidents in the future and stabilize network operations.