为什么Runspace.OpenAsync()忽略InitialSessionState

我正在编写与PowerShell接口的代码。我最初有以下内容：

using (var runspace = RunspaceFactory.CreateRunspace(initialSessionState))
{
    runspace.Open();

这个代码运行得很好。然而，由于这段代码实际上已经在异步方法中了，我写了以下内容只是为了进行实验：

public static Task OpenTaskAsync(this Runspace runspace)
{
    if (runspace.RunspaceStateInfo.State == RunspaceState.Opened)
        return Task.FromResult<object>(null);
    var tcs = new TaskCompletionSource<object>();
    EventHandler<RunspaceStateEventArgs> stateHandler = null;
    stateHandler = (o, e) =>
    {
        if (e.RunspaceStateInfo.Reason != null)
        {
            runspace.StateChanged -= stateHandler;
            tcs.TrySetException(e.RunspaceStateInfo.Reason);
        }
        else if (e.RunspaceStateInfo.State == RunspaceState.Opened)
        {
            runspace.StateChanged -= stateHandler;
            tcs.TrySetResult(null);
        }
    };
    runspace.StateChanged += stateHandler;
    runspace.OpenAsync();
    return tcs.Task;
}

然而，在将我的代码更改为以下代码后：

using (var runspace = RunspaceFactory.CreateRunspace(initialSessionState))
{
    await runspace.OpenTaskAsync();

我的测试现在失败了。原因是PowerShell无法再从导入到我的InitialSessionState（在创建运行空间之前）的模块中找到命令。我无法确定为什么会发生这种情况。我已经调试过，并且运行空间在该任务完成后是打开的并且可用的，在它完成之前，我不会继续调用任何命令。有什么想法吗？