Fixing #6265 exposes failing tests in test\powershell\Modules\Microsoft.PowerShell.Security\CertificateProvider.Tests.ps1.

The error message is: "Expected $null to be different from the actual value, but got the same value."

see: https://dev.azure.com/powershell/PowerShell/_build/results?buildId=42916&view=ms.vss-test-web.build-test-results-tab