NullReferenceException caused by ConfigureAwait.Fody

[Storm-BE]

Describe the issue

The following code throws a NullReferenceException when processed by ConfigureAwait.Fody.
It finishes successfully when the weaver is disabled.

Console.WriteLine("Hello, World!");
string? someString = null;
await (someString == "anyValue" ? SomeMethodAsync() : SomeMethodAsync());
Console.WriteLine("Finished successfully!");

static Task SomeMethodAsync()
{
    return Task.CompletedTask;
}

It does not throw when I save the Task to a local variable and await in a separate statement

var toAwait = (someString == "anyValue" ? SomeMethodAsync() : SomeMethodAsync());
await toAwait;

Typical stack trace:

System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Threading.Tasks.Task.AddTaskContinuationComplex(Object tc, Boolean addBeforeOthers)
   at System.Threading.Tasks.Task.AddTaskContinuation(Object tc, Boolean addBeforeOthers)
   at System.Threading.Tasks.Task.UnsafeSetContinuationForAwait(IAsyncStateMachineBox stateMachineBox, Boolean continueOnCapturedContext)
   at System.Runtime.CompilerServices.TaskAwaiter.UnsafeOnCompletedInternal(Task task, IAsyncStateMachineBox stateMachineBox, Boolean continueOnCapturedContext)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AwaitUnsafeOnCompleted[TAwaiter](TAwaiter& awaiter, IAsyncStateMachineBox box)
   at Program.<Main>$(String[] args) in C:\Repos\experiments\configureawait-fody-nre-bug-repro\Program.cs:line 3
   at Program.<Main>(String[] args)

I'm running:

• dotnet 6
• Fody 6.7.0
• ConfigureAwait.Fody 3.3.2

Minimal Repro

Can be found here: https://github.com/Storm-BE/configureawait-fody-nre-bug-repro

Make an effort to fix the bug

If I find some time I hope to have a look at this myself