When CancellationTokenSource is passed, the server side is different from the client side.

[WXWYK]

Describe the bug
Task DoTask(CancellationTokenSource cancellationToken);
When the client calls DoTask(cancellationToken),cancellationToken has been cancelled,
But the server receives the CancellationToken is not cancelled.

Expected behavior
the server receives the CancellationToken is cancelled.

Screenshots