Confusing `await` time for async function calls in Timeline view

Hello,

While profiling the app which is using async/await functionality with dotTrace I noticed that there is some inconsistency in `await` time for parent and children methods. Let's consider this example:

static async Task Main()
{
    await ChildMethod();
}

static async Task ChildMethod()
{
    await SomeOperationAsync();
}

The interesting thing is that await time of Main method might be (or even will be) less than the await time of the ChildMethod which looks strange to me, because intuitively await time of parent should be at least as await time of child.

For real numbers let's go back to the previous example and assume that SomeOperationAsync is Task.Delay(n). So the await time of the parent will be x (x is ~n for the app targeting .NET 6.0 and < n for the app targeting .NET Core 3.1) and the await time of child will be ~2*x.

This is the screenshot from dotTrace to get an idea how it looks (for the app targeting .NET Core 3.1 and for Task.Delay(800)):

1. This is await time of the method Main. 567ms for await ChildMethod(), I expect this to be ~800, because ChildMethod awaits Task.Delay(800)
 2. This is await time of the method ChildMethod. 1140ms for await Task.Delay(800). I also expect this to be ~800.

Probably I misunderstand what await time in dotTrace is, so please correct me if so. I understand it as the time needed to schedule a task + real task execution.

Would be great if someone knew if this behavior is expected and could explain how to analyze it.

I'm using Timeline Viewer in dotTrace 2021.3.3.

Probably this is related somehow https://youtrack.jetbrains.com/issue/DTRC-25385