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Calling ToCancellationToken on completed task throws ObjectDisposedException #724

Description

@Trarizon

When calling ToCancellationToken on a completed task, an exception occurred

UniTask.CompletedTask.ToCancellationToken();
// System.ObjectDisposedException: The CancellationTokenSource has been disposed.

The source code of ToCancellationToken is

var cts = new CancellationTokenSource();
Core(task, cts).Forget();
return cts.Token;

If the task is completed, cts will be disposed synchronously in Core() and then accessing cts.Token causes ObjectDisposeException

Is this a bug or by design?

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