Async Main method returning Task exits prematurely without awaiting completion (latest Dragonfruit package)

[dpokluda]

Package: System.CommandLine.DragonFruit
Version: 0.4.0-alpha.25306.1

I really enjoy using the DragonFruit library for quickly creating simple console applications—it's been incredibly handy for rapid prototyping and small tools. I was sad to hear about the planned deprecation; hopefully, someone will continue maintaining or carry forward this functionality, as it's extremely useful!

Issue Description
When creating a simple async entry point method (Main) returning just a Task, DragonFruit doesn't appear to await the asynchronous operation correctly, causing the application to terminate prematurely.

Example to Reproduce:

public static async Task Main(int number = 1)
{
    Console.WriteLine("Running...");
    await Task.Delay(TimeSpan.FromSeconds(number));
    Console.WriteLine("Finished."); // <-- This line never prints
}

In the above example, the "Finished." message is never displayed, and the program exits immediately after printing "Running...".

Workaround:
Changing the return type from Task to Task<int> and returning an explicit integer at the end resolves the issue:

public static async Task<int> Main(int number = 1)
{
    Console.WriteLine("Running...");
    await Task.Delay(TimeSpan.FromSeconds(number));
    Console.WriteLine("Finished."); // <-- Works correctly now
    return 0;
}

Expected Behavior
DragonFruit should properly await completion of asynchronous tasks for entry-point methods that return Task, not just those returning Task<int>.

Is this a known issue or by-design limitation? Would greatly appreciate guidance or clarification.

Thank you again for your great work on DragonFruit!