Canceling ConnectAsync lead to crash

Hello, I'm trying to establish connection with ConnectAsync and I display a window to allow the user to cancel the attempt.
I experiment a System.InvalidOperationException: 'An attempt was made to transition a task to a final state when it had already completed.' each time I cancel.

Here is my simplified code to reproduce with systematic cancelation. Am I missing something ? I'm not familiar with async/await usage so maybe I miss something important...

Thank you in advance.

public bool ConnectAndCancel()
{
	CancellationTokenSource source = new CancellationTokenSource();
	CancellationToken token = source.Token;

	Task task = _sftpClient.ConnectAsync(token);

	source.Cancel();

	try
	{
		task.Wait(token);
	}
	catch (OperationCanceledException)
	{
		Console.WriteLine("Canceled");
	}

	return _sftpClient.IsConnected;
}

Start by reproducing the issue with the supplied ConnectAsync cancellation example and trace how cancellation is handled when the token is canceled immediately. Done means cancellation no longer causes the InvalidOperationException and the connection state remains correct after the task finishes.