Ethereum validator participation plummeted to 74% at epoch 411448 following a critical bug in the Prysm consensus layer client after the Fusaka upgrade. This issue disrupted network synchronization and voting participation. However, the network largely recovered by epoch 411712, with participation rebounding to 99%. The incident underscored the importance of client diversity, as other consensus clients like Lighthouse and Teku remained unaffected. In response, Prysm's validator share decreased from 22.71% to 18%, as operators diversified their client usage to bolster network resilience.