Quote:It's been a couple of months since Microsoft released new cumulative updates in-between Patch Tuesdays, but it seems that now that the holidays are over, the company is back on schedule. Yesterday evening, it released new updates for all supported versions except for the newest and the oldest ones, a common trend for the first mid-stream patch day. Updates for versions 1903 and 1909 will likely come later.
 
It's worth noting, however, that in previous months when these mid-stream updates were released, there's only been a build missing from the newest and oldest versions, rather than the two newest. That change is because versions 1903 and 1909 gets the exact same updates, so this current trend will continue.
 
If you're on Windows 10 version 1809, you're going to see KB4534321, which brings the build number to 17763.1012. 
You can manually download it here, and these are the highlights:

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• Updates an issue with Windows Mixed Reality that occurs after upgrading to a new version of Microsoft Edge.
  
• Updates an issue that causes a device to repeatedly go into the Windows Out Of Box Experience (OOBE) restart loop in certain situations.
  
• Updates an issue that causes the touch keyboard to close when you select any key.
  
• Updates an issue that prevents users from reducing the size of a window in some cases.
  
• Updates an issue that changes the user-customized order of tiles in the Start menu even though the layout is locked or partially locked.
  
• Updates an issue that causes the Settings page to close unexpectedly.
  
• Updates an issue that might prevent a user’s settings from syncing across devices.
  

 
For Windows 10 version 1803, you'll get KB4534308, bringing the build number to 17134.1276. You can manually download it here, and there's one highlight:

Quote:

• Updates an issue that might prevent a user’s settings from syncing across devices.