Asp.net api Endpoint, IAsyncEnumerable stream being buffered

Hello, I'm using .net 7, http://asp.net core api w/controllers and I"ve tried with minimal api on VS 2022. Using c# to stream using IAsyncEnumerable some simple text line by line. Ive tried a simple obj. Ive tried ints. No matter what I've tried the response keeps getting buffered.

Here's the code Im testing with:

[HttpGet("numbers")]  
public async IAsyncEnumerable<Wrapper> GetNumbers()  
{        
	await foreach(var r in FetchItems())      
	{                         
		yield return  r;     
	}  
}  

static async IAsyncEnumerable<Wrapper> FetchItems()  
{      
	Wrapper wrapper = new Wrapper();      
	for (int i = 1; i <= 10; i++)      
	{           
		wrapper.Number = i;           
		wrapper.Content = "Content " + i;          
		await Task.Delay(300);          
		yield return wrapper;      
	}  
}

****
public class Wrapper 
{     
	public int Number { get; set; }     
	public string Content { get; set; } 
}