When downoading from sharepoint with buffer size always getting maximum 8K buffer and not as we asked

Describe the bug

When downloading file from sharepoint using graph api and set the buffer size to be downloaded only 8K ( maximum) is fetched ) instread of the given buffer size.
InputStream inputStream = graphServiceClient.drives().byDriveId(driveId).items().byDriveItemId(getDriveItemIdFromRootPath(filePath)).content().get();
byte[] buf = new byte[cloudPartSizeWhenDownloadingToLocal];
int bytesRead;
while ((bytesRead = srcInputStream.read(buf)) != -1) {
byresRead is always maximum 8K and not per demand
}

Expected behavior

The bytess returned from this method should aline with the request.

How to reproduce

see above

SDK Version

6.25.1

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

</details>


### Configuration

_No response_

### Other information

_No response_

Beginne beim Aufruf graphServiceClient.drives().byDriveId(...).content().get() und untersuche, wie der zurückgegebene Java InputStream read(byte[]) für SharePoint-Downloads verarbeitet. Vergleiche die beobachteten 8K-Lesevorgänge mit dem Vertrag von Java InputStream und der Stream-Implementierung des SDK; abgeschlossen ist die Aufgabe, wenn das angeforderte Pufferverhalten entweder korrigiert oder eindeutig durch einen Regressionstest abgedeckt ist.