Microsoft has warned Windows 11 users that they might experience issues launching and using some .NET Framework 3.5 applications.
This known issue impacts only systems running Windows 11, version 21H2, where users have installed the KB5012643 optional preview cumulative update.
Affected apps use optional components such as Windows Workflow (WWF) and Windows Communication Foundation (WCF).
“After installing KB5012643, some .NET Framework 3.5 apps might have issues or might fail to open,” Microsoft revealed on the Windows health dashboard.
The company also addressed another known issue triggered after installing this Windows non-security update, leading to flickering screen problems in Safe Mode without Networking.
The same KB5012643 issue also made some Windows apps (e.g., File Explorer, Start Menu, and Taskbar) seem unstable while running in Safe Mode.
Workaround available for affected systems
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Source: BleepingComputers