Mono memory leak reproduction

Progam.cs

using System;
using System.Threading;
using System.Threading.Tasks;

namespace TimerTest
{
    public static class Program
    {
        private static int tickCount;

        public static void Main()
        {
            StartSleepingTask();
            StartSleepingTask();

            while(true)
            {
                for(var i = 0; i < 1000; i++)
                {
                    ThreadPool.UnsafeQueueUserWorkItem(Tick, null);
                    Thread.Sleep(10);
                }

                GC.Collect();
            }

            // ReSharper disable once FunctionNeverReturns
        }

        private static void StartSleepingTask()
        {
            var task1 = new Task(() => Thread.Sleep(TimeSpan.FromDays(24)));
            task1.Start();
        }

        private static void Tick(object obj)
        {
            tickCount++;
            if(tickCount % 1000 != 0) return;

            Console.WriteLine($"Ticks: {tickCount}");
        }
    }
}