Почему разный тип возвращаемых данных при использовании await?

class TaskTests
{
    public Task<int> GetIntAsync(int divider)
    {
        return Task.Run<int>(() =>
        {
            Random r = new Random();
            while (true)
            {
                int value = r.Next(1, 100);
                if (value % divider == 0)
                    return value;
 
                Thread.Sleep(100);
            }
        });
    }
}

public static async Task MainAsync(string[] args)
{
    TaskTests testTasks = new TaskTests();
    List<Task<int>> tasks = new List<Task<int>>
    {
        testTasks.GetIntAsync(2),
        testTasks.GetIntAsync(3),
        testTasks.GetIntAsync(4),
        testTasks.GetIntAsync(5),
        testTasks.GetIntAsync(6),
        testTasks.GetIntAsync(7),
        testTasks.GetIntAsync(8),
        testTasks.GetIntAsync(9)
    };
 
    var result1 = await tasks.First();
    var results = tasks.Select(async t => await t).ToList();
}

async Task<int> Lambda(Task<int> task)
{
   return await task;
}
 
tasks.Select(new Func<Task<int>, Task<int>>(Lambda))

Task<int> Lambda(Task<int> task)
{
   return task;
}
 
tasks.Select(new Func<Task<int>, Task<int>>(Lambda))

var results = tasks.Select(async t => await t).ToList();

var results = tasks;

Random random = new Random(DateTime.Now.Millisecond);

static Random random = new Random();

Random r = new Random();