I see that you have added the 'azure-api-management' tag and the issue is not related to APIM service.
But looking into the document for the Resource - List API the you can use the
$expand in the query parameter with and specify the property that you want to retrieves all with the default properties.
As you want the GenericResourceExpanded.properties then you can specify the property name listed under GenericResourceExpanded in the $expand query parameter
The above will return the createdTime, changedTime and provisioningState under the GenericResourceExpanded object.
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