Exclusions in Windows 10 Registry Don't Show in Windows Security GUI

[ln899]

I'm having trouble with exclusions in Windows 10, 64bit, 21H2.When I go to Windows Security/Virus & threat protection/Manage settings/Exclusions, and try to add an exclusion for a file or folder, it asks me to grant admin rights, I do so, and then nothing happens. No record of any exclusion appears, nor is there any record of previously created exclusions.When I go to the registry, "Hkey_Local_Machine\Software\Microsoft\Windows Defender\Exclusions\Path," I see a list of 12 or so previously created exclusions that are indeed in place, but not showing up on the Windows Security GUI.I've run

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