@AbeZ
Hi,
As far as I know, there is no related known issues has been offered.
https://learn.microsoft.com/en-us/windows/release-information/status-windows-10-20h2
Did you mean layoutmodification.xml not work?
If so, see the guides below:
https://learn.microsoft.com/en-us/windows/configuration/start-layout-xml-desktop
https://learn.microsoft.com/en-us/windows/configuration/customize-and-export-start-layout
Also, you could check your Start Layouts with an xml validator.
Hope above information can help you.
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