Exception: Start may not be called on a continuation task

[JeremyBP]

I'm getting this exception when using ExecutionAwareCommand.FromTask< MyObject >(MyMethod);
No problem with ExecutionAwareCommand.FromTask(MyMethod).
So I digged into the source code of the ExecutionAwareCommand< T > class and found a Start() call wich throws the exception.
Then, if I just remove the Start call like it is into the ExecutionAwareCommand, no more exception and task just runs like it should...
Any reason of this Start call that I miss?

[dansiegel]

can you provide a reproduction of the issue?

[JeremyBP]

I started with the fresh latest master commit.
On the provided sample, I just added a button on the MainPage like so:

<Button Text="Command with param" Command="{Binding WithParamCommand}" CommandParameter="p1"/>

Then on the MainPageViewModel :

public ICommand WithParamCommand { get; }

private async Task WithParamAsync(string param)
{
// Whatever awaitable stuff here doesn't matter
}

and finally into the construtor:

WithParamCommand = ExecutionAwareCommand.FromTask<string>(WithParamAsync);

From there, clicking on the button throws the InvalidOperationException: Start may not be called on a continuation task.

If you remove the .Start(); call, then no more exception.

Maybe I'm doing something wrong or missing something.