异步并行任务获取到错误的scope

[inversionhourglass]

using (var outerScope = serviceProvider.CreateScope())
{
    var locker1 = new EventWaitHandle(false, EventResetMode.ManualReset);
    var locker2 = new EventWaitHandle(false, EventResetMode.ManualReset);
    var t1 = Task.Run(() =>
    {
        // 等待并行线程t2先完成pScope的创建
        locker1.WaitOne();
        // 此时已pScope已完成创建，这里的scope理论应该是outerScope，但实际上是pScope
        locker2.Set();
    });
    var t2 = Task.Run(() =>
    {
        using (var pScope = outerScope.ServiceProvider.CreateScope())
        {
            // 通知t1，已完成pScope创建
            locker1.Set();
            locker2.WaitOne();
        }
    });
    await Task.WhenAll(t1, t2);
}