Workbook session not persisting changes

Describe the bug

I am trying to update workbook table rows within a created session (passing 'workbook-session-id' in the header) to improve the performance of my code but no changes occur, either immediately after update call or on session close.

Using the graph API explorer seems to work (create session, update row with session id, close session), although the changes occur immediately after row update, rather than on session close. Not sure if this is expected behavior.

Although not related to this, but in pursuit of improving the performance of my code I tried to use batch requesting, with and without a session id, and this also didn't work.

Additionally, it seems lots of your example code is incorrect (e.g. Close session c# snippet).

Expected behavior

Workbook table Rows are updated when used with a session

How to reproduce

The following works when the code to add the session id to header is removed

            var workbookFileDriveItem = await MsGraphHelpers.GetDriveItemWithAbsoluteUrl(graphClient, "https://mysharepointfilelocation.xlsx");

            var tableName = "mytable";
            var totalColumns = 134;
            var columnIndex = 131;
            var startRowIndex = 60;

            // create workbook session
            var session = await graphClient
                    .Drives[workbookFileDriveItem.ParentReference.DriveId]
                    .Items[workbookFileDriveItem.Id]
                    .Workbook
                    .CreateSession
                    .PostAsync(new Microsoft.Graph.Drives.Item.Items.Item.Workbook.CreateSession.CreateSessionPostRequestBody { PersistChanges = true });

            var cellValues = new string[] { "MyCellValueA", "MyCellValueB" };
            var rows = new string[][] {
                cellValues
            };

            // workaround due to broken SDK
            List<UntypedArray> jsonRows = CreateRowValues(totalColumns, columnIndex, rows);

            // update row with session
            var excelUpdateRowResponse =
                    graphClient
                            .Drives[workbookFileDriveItem.ParentReference.DriveId]
                            .Items[workbookFileDriveItem.Id]
                            .Workbook
                            .Tables[tableName]
                            .Rows["$/ItemAt(index=" + startRowIndex + ")"]
                            .PatchAsync(new UpdateWorkbookTableRowBody
                            {
                                Rows = jsonRows
                            }, config =>
                            {
                                config.Headers.Add("workbook-session-id", session.Id);
                            });

            // close session
            await graphClient
                    .Drives[workbookFileDriveItem.ParentReference.DriveId]
                    .Items[workbookFileDriveItem.Id]
                    .Workbook
                    .CloseSession.PostAsync(c =>
                    {
                        c.Headers.Add("workbook-session-id", session.Id);
                    });

SDK Version

No response

Latest version known to work for scenario above?

No response

Known Workarounds

No to use workbook sessions, which decreases performance

Debug output

</details>


### Configuration

_No response_

### Other information

_No response_

Start with the C# reproduction and trace the CreateSession, table row PatchAsync, and CloseSession calls, including the workbook-session-id headers and responses. Verify whether the row update is associated with the created session and whether PersistChanges takes effect on close. Done means the workbook table row changes persist when the session-based sequence runs.