Microsoft says a known issue that reverts mouse settings after installing the KB5120998 August 2026 preview update affects only non-English Windows 11 systems.

The bug was confirmed Friday, one day after the KB5120998 release, which includes Start menu, taskbar, and Windows search improvements for devices running Windows 11 versions 25H2 and 24H2.

According to user reports, mouse cursor personalization settings are changing or resetting automatically after installing the KB5120998 update, and affected Windows 11 users cannot restore their previous mouse settings after they are reverted.