Optional update KB5012643 causes problems in .NET Framework 3.5 apps
According to the official Microsoft support page, .NET Framework 3.5 applications that use optional components such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) might crash after installing Windows 11 Build 22000.652. Also known by its patch name KB5012643. As Neowin points out, not all .NET Framework 3.5 applications are affectedbut there is a workaround that Microsoft suggests that might bypass any issues.
Naturally, it is about uninstall and remove KB5012643 Windows 11. Using the Windows 11 Settings app. In the event that, for some reason, you cannot remove this update, Microsoft suggests re-enabling the .NET Framework 3.5 and Windows Communication Foundation in Windows Features. This is for advanced users only, as it requires running these instructions in an elevated command prompt.
1st dism /online /enable-feature /featurename:netfx3 /all
2nd dism /online /enable-feature /featurename:WCF-HTTP-Activation
3rd dism /online /enable-feature/featurename:WCF-No-HTTP-Activation
For now, this bug has been tagged as “mitigated” by Microsoft. That means it’s just a temporary solution. You’ll have to keep an eye out for a future update that fully resolves the issue. Microsoft says it’s working on a fix and will provide an update in an upcoming release. We hope that these problems will not occur in June and that the Redmond giant improves the stability of the system. In the meantime, we strongly recommend that you do not upgrade to Windows