I am trying to solve Array question on leetcode Array Merge Sort and issue is that when I am running my code in online compiler i.e. JS Fiddle, Programiz, I can see the complete array after concatenation but when I am running same code on leetcode compiler getting only first array instead of complete array.

Can someone please advise where, I am facing the issue.

PFA of issue -

Leetcode Submission Report --> Here, I'm getting half array instead of complete array.

Online Compiler Output --> Here, I'm getting the complete array.

Below is my code for Leetcode Question -

var merge = function(nums1, m, nums2, n) {
    let x = nums1.length;
    if(x !== m){
        for(let i = x; i > m; i--){
            nums1.pop(nums1[i]);
        }
    }
    return nums1.concat(nums2).sort((a,b)=> a -b);
};
console.log(merge([1,2,3,0,0,0],3,[2,5,6],3));