appcmd.exe to list IIS config section attribute is returning an ERROR message:Unknown attribute

Question

I am running this command as admin in elevated prompt:

%systemroot%\system32\inetsrv\appcmd list config "website" /section:requestFiltering /text:AllowDoubleEscaping

It returns error message: ERROR (message:Unknown attribute ""AllowDoubleEscaping"". Replace with -? for help.)

So I next ran the following command:

%systemroot%\system32\inetsrv\appcmd set config -section:requestFiltering -?

It returned this output and yes, I can see that the allowDoubleEscaping is missing

ERROR ( message:-allowHighBitCharacters
-unescapeQueryString
-removeServerHeader
-fileExtensions.allowUnlisted
-fileExtensions.applyToWebDAV
-fileExtensions.[fileExtension='string'].fileExtension
-fileExtensions.[fileExtension='string'].allowed
-requestLimits.maxAllowedContentLength
-requestLimits.maxUrl
-requestLimits.maxQueryString
-requestLimits.headerLimits.[header='string'].header
-requestLimits.headerLimits.[header='string'].sizeLimit
-verbs.allowUnlisted
-verbs.applyToWebDAV
-verbs.[verb='string'].verb
-verbs.[verb='string'].allowed
-hiddenSegments.applyToWebDAV
-hiddenSegments.[segment='string'].segment
-alwaysAllowedUrls.[url='string'].url
-alwaysAllowedQueryStrings.[queryString='string'].queryString
-denyUrlSequences.[sequence='string'].sequence
-denyQueryStringSequences.[sequence='string'].sequence
-filteringRules.[name='string'].name
-filteringRules.[name='string'].scanUrl
-filteringRules.[name='string'].scanQueryString
-filteringRules.[name='string'].scanAllRaw
-filteringRules.[name='string'].denyUnescapedPercent
-filteringRules.[name='string'].scanHeaders.[requestHeader='string'].requestHeader
-filteringRules.[name='string'].appliesTo.[fileExtension='string'].fileExtension
-filteringRules.[name='string'].denyStrings.[string='string'].string

So which files is appcmd actually checking for these? I went ahead and checked the C:\Windows\System32\inetsrv\config\schema\IIS_schema.xml file and it does have this attribute defined in there. This seems to be the only place this is defined, so I am confused where else its not finding this attribute to throw the error??

<sectionSchema name="system.webServer/security/requestFiltering">
    <attribute name="allowDoubleEscaping" type="bool" defaultValue="false" />
    <attribute name="allowHighBitCharacters" type="bool" defaultValue="true" />
    <attribute name="unescapeQueryString" type="bool" defaultValue="true" />