Windows 11 Preview Update KB5012643 (April 25, 2022)

[German]Microsoft has released the optional cumulative (preview) update KB5012643 for Windows 11 as of April 25, 2022. The preview updates for Windows 10 and Windows Server are described in separate articles. The KB5012643 update was previously tested with Windows 11 Insiders. Below I provide an overview regarding these updates for Windows 11.

It should be noted that these updates are so-called preview or preview updates. These are optional and must be manually triggered for download and installation by default.

Preview Updates for Windows 11

The list of updates for Windows 11 can be found on this Microsoft page. The following preview updates have been made available for Windows 11 as of March 28, 2022. 

Update KB55012643 for Windows 11

Preview Update KB5012643 for Windows 11 raises the OS build to 22000.652 and provides a number of fixes for these Windows versions. Here are the changes and fixes, described below as 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.  

The highlights above refer to display problems during video playback or in the GUI. More relevant to me seem the fixes in Secure Boot or the fix of a race condition at startup, which could end in a stop error. The fix of the bug that probably exists in several Windows versions (mainly in POS terminals), which leads to delays of up to 40 minutes during booting, should also be fixed. Microsoft states the following improvements and fixes in the support article that the update makes:

• 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.

The update is optional and is only offered when the user explicitly selects optional updates for installation in the settings page. The update can also be downloaded and installed from the Microsoft Update Catalog. The latest Servicing Stack Update (SSU) is included to fix various issues. Microsoft lists a known issue related to the backup function (see also my blog post Windows 10/11: Backup and Restore from Win7 is broken since Jan. 2022). Microsoft is working on this problem. If in doubt, please refer to the support article for further details. On deskmodder.de there is this post, where in the user comments the installation error 0x800F0988 is mentioned. A repair installation via Inplace-Upgrade may help.

Similar articles:
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Patchday: Windows 11/Server 2022 Updates (April 12, 2022)
Windows 7/Server 2008R2; Windows 8.1/Server 2012R2: Updates (April 12, 2022)
Windows 10 / Windows Server Preview Update KB5012636 (April 21, 2022)
Windows 10 / Windows Server (20H2-21H2) Preview Updates (April 25, 2022)
Windows 11 Preview Update KB5012643 (April 25, 2022)
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