为什么Distinct (Linq)在int[]列表中不起作用？

using System;
using System.Collections.Generic;
using System.Linq;

public class IntArrayEqualityComparer : IEqualityComparer<int[]>
{
    public bool Equals(int[] x, int[] y)
    {
        if (x == null && y == null)
            return true;
        if (x == null || y == null)
            return false;
        if (x.Length != y.Length)
            return false;
        for (int i = 0; i < x.Length; i++)
        {
            if (x[i] != y[i])
                return false;
        }
        return true;
    }

    public int GetHashCode(int[] obj)
    {
        if (obj == null)
            return 0;
        int hash = 17;
        foreach (int item in obj)
        {
            hash = hash * 23 + item.GetHashCode();
        }
        return hash;
    }
}

public class Program
{
    public static void Main()
    {
        int[] numbers1 = { 1, 2, 3, 4, 5 };
        int[] numbers2 = { 1, 2, 3, 4, 5 };
        int[] numbers3 = { 1, 2, 3, 4, 6 };

        List<int[]> list = new List<int[]> { numbers1, numbers2, numbers3 };

        var distinctList = list.Distinct(new IntArrayEqualityComparer());

        foreach (var numbers in distinctList)
        {
            Console.WriteLine(string.Join(", ", numbers));
        }
    }
}