I'm doing the "Chunky Monkey" practice on freeCodeCamp and I'm trying to debug the program on VS Code. But I'm getting a different result than the one I get when I try to run it on the fCC console. fCC returns the expected result for the case, the original array,, but I get a different output on VS Code. Here's the code I made:

function chunkArrayInGroups(arr, size) {
    let groupArr = arr.slice(0);   // VS Code returns [4, 5, 6, 7]
    //console.log(groupArr)
    const groupTarget = Math.ceil(arr.length / size);
    console.log(groupTarget)
    let group = 1;
    console.log(group)
    let finalArr = [];
    for (let i = 0; i < size; i++) {  // iterates though the array 'size' times 
      if (group == groupTarget) {     // if for when we are on the last array to fill
        for (let j = 0; j < size; j++)  // for to iterate size amount of times to see if there is no undefined
        {
          if (groupArr[j] == undefined) { //if there is a undifined value, we'll make a smaller array for the last group 
            finalArr.push(groupArr.splice(0, j))
            console.log(finalArr)
          }
        }
      }
      finalArr.push(groupArr.splice(0, size))  // if we are not on the last group, we just splice the original value and push it 
      console.log(finalArr)
    } 
    return finalArr; // once loops end, we return the finalArray
  }
  
  chunkArrayInGroups([0, 1, 2, 3, 4, 5, 6, 7, 8], 4); 

Hope someone is able to help. Did I mess up something on VS Code? I only copied the exact code that I had.