My solution does not work with this array [0,3,7,2,5,8,4,6,0,1]

class Solution {
public:
    int longestConsecutive(vector<int>& nums) {
        sort(nums.begin(), nums.end());
        int length = 0;
        for(int i = 0; i < nums.size() - 2; i++)
        {
            if(nums[i] - nums[i + 1] == -1)
            {
                length++;
            }
        }
        return length + 1;
    }
};

I tried plugging it even to chatgpt, but it does not spot the problem.