2020-11 Cumulative Update Preview for .NET Framework 3.5 and 4.8 for Windows 10, version 20H2 for x64 (KB4586876) rolling out now.
The quality and reliability improvements of version KB4586876:
- Windows Presentation Foundation (WPF): Addresses an issue in which a FailFast crash occurs in apps that have two threads that both load application resources.
- Runtime: Improves the clean-up process for X509Certificate2 certificates.