Microsoft has acknowledged a Windows 11 bug that can reset mouse cursor personalization settings after users install the KB5120998 August 2026 non-security preview update, according to BleepingComputer. The issue applies after installation of Windows updates released August 27, 2026, including KB5120998, BleepingComputer reports, citing Microsoft. User reports say cursor personalization settings are being changed or reverted to standard settings after installation. According to Microsoft’s description cited by BleepingComputer, some users are seeing appearance regressions and intermittent animation changes. Reports include high-DPI mouse cursors being replaced with larger white cursors, and custom cursor animations reverting to standard settings. Affected users reportedly have been unable to restore their previous cursor customizations after the reset. Microsoft said it is still investigating the root cause and asked affected customers to submit reports through the Windows Feedback Hub. KB5120998 was released as an optional, non-security preview update for Windows 11 versions 25H2 and 24H2. BleepingComputer says the update included improvements to the Start menu, taskbar, and Windows Search. Because it is an optional preview update, Windows 11 users generally have to select “Download and install” to receive it, according to BleepingComputer. The exception is users who have enabled the setting to get the latest updates as soon as they are available, which can cause Windows to install it automatically. Who benefits: There is no clear beneficiary. Affected users may help narrow the root cause by filing Feedback Hub reports, as Microsoft requested. Who's exposed: Windows 11 users on versions 25H2 and 24H2 who installed KB5120998, or Windows updates released August 27, 2026 and later as described by Microsoft, are the reported exposure group. Users with automatic early-update settings enabled may have received it without manually selecting the preview update.