UPDATE 1/15/21: We are starting to roll out Cumulative Update Build 21292.1010 (KB4601937). This update does not include anything new and is designed to test our servicing pipeline.
KNOWN ISSUE: After installing Build 21292.1010 (KB4601937), x64 emulation on ARM PCs will not work. There is an issue with the way the update is installed that breaks this functionality. As a workaround, you can uninstall KB4601937 to get x64 emulation working again on your ARM PC.