Select-Object reports an error when -ExpandProperty is used on a hashtable member that is not a key.

Version:
PowerShell 7 Preview 5

Reproduce:
$PSVersionTable | Select-Object -expandProperty Keys

Expected Result:
[list of hashtable keys]

Actual Result:
Exception:
Select-Object: Property "count" cannot be found.

Workaround:
$PSVersionTable | ForEach-Object { $_.Keys }

Details:
https://powershell.one/bugs/powershell-7/select-object