@EddieL [MSFT],
Here is the current list of verified open issues with build 21364.1:
https://aka.ms/AAb4rf8 Manage Disks and Volumes shows internal SSD even when it is an HDD.
https://aka.ms/AAayvn0 Some or all new feature configurations disappear after a scan "CHKDSK C: /F"
https://aka.ms/AAbwjod Right Click > Open With > does not have the option to open with Paint anymore for files without extension. (Build 21354.1)
https://aka.ms/AAbwet8 Build 21354.1+, mspaint.exe cannot be opened by system
https://aka.ms/AAc0m27 Build 21364 the KB for .NET pops an error 0x80092004