Users of Windows 11 25H2 in the Release Preview channel experienced an unexpected transition to the Beta channel after installing Build 26200.7921, as the Release Preview option disappeared from the selection menu due to a server configuration issue. This change forced Windows Update to download version 26220.7872 without user consent. The distinction between the channels is significant, with Release Preview operating within the 26200 band and Beta in the 26220 band. On February 25, 2026, Microsoft restored the Release Preview channel, allowing users to revert to it through a manual update. The Insider Program has evolved into a complex system involving build bands, server-side feature gates, telemetry evaluation, and dynamic channel assignment, which can lead to misconfigurations. Best practices for participants include regularly checking for updates, managing automatic installations, and maintaining recovery snapshots.