Microsoft Confirms KB5120998 Mouse Reset Bug Only Hits Non-English Windows 11 PCs
Microsoft has clarified the scope of a known issue tied to the KB5120998 preview update for Windows 11, confirming it only affects systems running non-English language editions. After installing the update, impacted machines revert customized mouse settings—like pointer speed or button configuration—back to their defaults.
The company says it's aware of the bug and is working on a fix, though no timeline has been given. In the meantime, affected users will need to manually reconfigure mouse settings after each restart or update cycle until Microsoft ships a patch.
This is a preview update, meaning it's optional and mainly used by IT admins and enthusiasts testing upcoming fixes before they roll into the next Patch Tuesday release.
Why it matters: Preview updates are meant to surface exactly these kinds of regressions before mass deployment, so this is the system working as intended rather than a widespread emergency. Still, sysadmins managing multilingual fleets should hold off pushing KB5120998 broadly until Microsoft issues a fix, and should flag it in testing rings.