Unable to update fields of driveitem using '.ItemWithPath(documentSetName).PatchAsync(driveItem)'

[spmanjunath]

I am trying to update SharePoint's DocumentSet metadata using below code, the call returns 200OK, but nothing is updated. What is wrong with the below code?

var driveItem = new DriveItem
{
    Name = "test01",
    ListItem = new ListItem
    {
        Fields = new FieldValueSet
        {
            AdditionalData = new Dictionary<string, object>
            {
                {
                    "CompanyCode" , "test01"
                },
                {
                    "CaseStatus" , "InProgress"
                }
            }
        }                    
    }
};

GetGraphClient().Drives[driveId].Root.ItemWithPath(documentSetName).PatchAsync(driveItem);

Note:

• I have read that it is possible to do this update using lists[listID]/items[itemID], this approach requires 2 calls, first call to get the ItemId, subsequent to update - this would cause performance issues when there many documentsets to be updated.
• In Graph SDK 3.4 version it was possible to update fields using .ListItem.Fields.Request().UpdateAsync - the SDK version 5.7 does not have similar capability.