Update Windows 11 KB5012643 released – here’s everything new and improved

Gandalf_The_Grey

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KB5012643 is now available for Windows 11 with a few noteworthy changes and a range of additional bug fixes. The update is rolling out via Windows Update and WSUS, but you can also download the offline installers of Windows 11 KB5012643. The offline installers are particularly helpful when users are unable to install the patch via the traditional methods.

Windows 11 KB5012643 is an optional cumulative preview update and it is designed to test the changes set to ship with May 2022 Patch Tuesday updates. Like the rest of the optional updates, this cumulative update won’t download and install automatically unless you check for updates and manually start the download.

This optional cumulative update is not a huge release unlike the March 2022 optional update, but there are several quality improvements. For example, Microsoft has added a new feature that would display the temperature on top of the weather icon which was added to the taskbar with the April 2022 Update.

Microsoft has fixed an issue where the OS incorrectly aligns video subtitles and another bug has been fixed where the video subtitles will be partially cut off. Microsoft says it also made changes to prevent users from using the Windows window controls, such as minimize, maximize, and close buttons.
 

silversurfer

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Highlights​

  • Updates an issue that might cause video subtitles to be partially cut off.
  • Updates an issue that incorrectly aligns video subtitles.
  • Displays the temperature on top of the weather icon on the taskbar.
  • Updates an issue that prevents you from using the minimize, maximize, and close buttons on a maximized app window.

Improvements​

This non-security update includes quality improvements. Key changes include:
  • New! Adds improvements for servicing the Secure Boot component of Windows.
  • Addresses an issue that causes the AppX Deployment Service (AppXSvc) to stop working after you install certain MSIX apps.
  • Addresses a race condition that occurs early in the startup process that might cause a stop error.
  • Improves the Autopilot client to process updated Trusted Platform Module (TPM) capabilities that support self-deployment and pre-provisioning scenarios.
  • Changes the timeout for Azure Active Directory (Azure AD) registration from 60 minutes to 90 minutes for hybrid Azure AD-joined Autopilot scenarios. This also addresses a race condition that causes an exception at timeout.
  • Addresses an issue in which certain Point of Sale terminals experience occasional OS startup delays during restart of up to 40 minutes.
  • Addresses a memory leak issue that affects Windows systems that are in use 24 hours each day of the week.
  • Addresses an issue that affects the Dynamic Host Configuration Protocol (DHCP) option 119 (Domain Search Option) by preventing the use of the connection-specific DNS Suffix Search List.
  • Addresses an issue that affects the Title attribute in Microsoft Ege IE mode.
  • Addresses an issue in which mobile device management (MDM) policies were not allowed on Windows Enterprise editions that were upgraded to Enterprise using Azure AD-joined subscription entitlement.
  • Addresses an issue that might cause video subtitles to be partially cut off.
  • Addresses an issue that incorrectly aligns video subtitles.
  • Addresses an issue that causes Kerberos authentication to fail, and the error is “0xc0030009 (RPC_NT_NULL_REF_POINTER)”. This occurs when a client machine attempts to use the Remote Desktop Protocol (RDP) to connect to another machine while Remote Credential Guard is enabled.
  • Addresses an issue that causes Windows to go into BitLocker recovery after a servicing update.
  • Addresses an issue that prevents retrieval of the Endorsement Key (EK) certificate from the TPM device.
  • Addresses an issue that might fail to copy the security portion of a Group Policy to a machine.
  • Addresses an issue that prevents the instantiation of the Microsoft RDP Client Control, version 11 and higher, inside a Microsoft Foundation Class (MFC) dialog.
  • Displays the temperature on top of the weather icon on the taskbar.
  • Addresses an issue that prevents you from using the minimize, maximize, and close buttons on a maximized app window. This issue occurs because the Notification Center keeps the input focus.
  • Addresses an issue that might occur when you use Netdom.exe or the Active Directory Domains and Trusts snap-in to list or modify name suffixes routing. These procedures might fail. The error message is, "Insufficient system resources exist to complete the requested service." This issue occurs after installing the January 2022 security update on the primary domain controller emulator (PDCe).
  • Addresses an issue that causes the primary domain controller (PDC) of the root domain to generate warning and error events in the System log. This issue occurs when the PDC incorrectly tries to scan outgoing-only trusts.
  • Addresses an issue that occurs when you map a network drive to a Server Message Block version 1 (SMBv1) share. After restarting the OS, you cannot access that network drive.
  • Addresses an issue that affects an SMB multichannel connection and might generate a 13A or C2 error.
  • Addresses an issue that damages a pool when a Client-Side Caching (CSC) cleanup method fails to delete a resource that was created.
  • Addresses an issue that might cause the server to lock up because the nonpaged pool grows and uses up all memory. After a restart, the same issue occurs again when you try to repair the damage.
  • Reduces the overhead of resource contention in high input/output operations per second (IOPS) scenarios that have many threads contending on a single file.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
 

silversurfer

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Microsoft released an optional Windows 11 update 22000.652 (KB5012643) a couple of days ago that added several changes and bug fixes including one that led to near-hour long startup delays.

However, the update has apparently introduced a new bug to Windows 11 systems wherein there is flickering on the screen when one enters the Safe Mode.
 

silversurfer

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Microsoft has addressed a newly acknowledged known issue that caused flickering screen problems and made some Windows apps (e.g., File Explorer, Start Menu, and Taskbar) seem unstable in Safe Mode without Networking.

The problems only affect systems running Windows 11, version 21H2, where users have installed the KB5012643 optional preview cumulative update.

"Devices experiencing this issue can log a System error on the Windows Event Log, with Source 'Winlogon' and the following description: 'The shell stopped unexpectedly and explorer.exe was restarted'," Microsoft explained.

Microsoft addressed the issue using Known Issue Rollback (KIR), a Windows capability that allows reverting problematic non-security fixes delivered via Windows Update.

While the fix has likely reached all consumer devices and non-managed business devices within 24 hours, over the weekend, you might be able to speed up the process if your system hasn't yet received it by restarting your Windows device.

Since the issue only impacts devices that started using the "Safe Mode without Networking" option, you can also work around the display problems by booting into "Safe Mode with Networking."
 

Sorrento

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I've got to the point where I no longer bother with 'preview' updates, this my main PC is running perfectly & after months of Dev & Beta - I'm now sticking none preview, though no guarantee of no issues? :p:p
 
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silversurfer

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They are releasing it again?
My guess this fix will be delivered to every user of Windows 11 next week on Patchday (Tuesday, 10th May).

BC article notes:
Microsoft addressed the issue using Known Issue Rollback (KIR), a Windows capability that allows reverting problematic non-security fixes delivered via Windows Update.
 

silversurfer

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As spotted by BetaNews, Microsoft has updated its Windows 11 known issues webpage to add that some .NET Framework 3.5 apps might suffer problems after installing KB5012643. Although the company hasn't highlighted all the potential problems, one includes apps not opening at all. It is important to note that this does not affect all .NET Framework 3.5 apps, it has only noticed this happening with those that are using optional .NET Framework 3.5 components such as Windows Communication Foundation (WCF) and Windows Workflow (WWF) components.



 
Last edited:

MuzzMelbourne

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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.