The latest optional Windows 11 update 22000.652 (KB5012643) seems to have a bug in the Safe Mode that causes screen flickering. Thankfully, there appears to be an unofficial workaround available.

Microsoft responds to Windows 11 complaints with 2026 updates bringing moveable taskbars, reduced Copilot interference, and ...

Microsoft has released the Windows 11 KB5013943 cumulative update with security updates, improvements, and fixes for screen flickers in Safe Mode and a bug causing some NET 3.5 apps not to open.