Dynamic programming code works in javascript but not in python

I am learning Dynamic Programming from freecodecamp, the instructor is using JavaScript and i know python so i am converting the logic in python.

Long story short, this problem's JavaScript implementation is working fine, but my python implementation is giving strange output.

I have matched the syntax many times and verified the logic, i can't point out where i am going wrong. Any help would be appreciated.

Problem Statement: Create a program to find the smallest sub-array of integers whose sum is equal to targetsum.

JavaScript Implementation:

const bestsum = (targetsum, numbers, memo={}) => {
    if (targetsum in memo) return memo[targetsum];
    if (targetsum === 0) return [];
    if (targetsum <0) return null;
    
    let shortestcomb = null;
    
    for (let num of numbers){
        const remainder = targetsum - num;
        const remaindercomb = bestsum(remainder, numbers, memo);
        if (remaindercomb !== null){
            const combination = [...remaindercomb, num];
            if (shortestcomb===null || combination.length < shortestcomb.length){
                shortestcomb = combination;
            }
        }
    }
    memo[targetsum] = shortestcomb;
    return shortestcomb;
}
console.log(bestsum(7, [2, 4, 3]));
console.log(bestsum(100, [1, 2, 5, 25]));

Output:

[ 3, 4 ]
[ 10, 10 ]

My Python Implementation:

def bestsum(targetsum, arr, memo=None):
    if memo is None:
        memo={}
    if targetsum in memo: return memo[targetsum]
    if targetsum==0: return []
    elif targetsum < 0: return None
    shortest = None 
    for i in arr:
        remainder = targetsum-i
        seq = bestsum(remainder, arr, memo)
        if seq!=None:
            seq.append(i)
            if (shortest==None or len(seq)<len(shortest)):
                shortest = seq
    memo[targetsum] = shortest
    return shortest

print(bestsum(7, [2, 4, 3]))
print(bestsum(20, [5, 10]))

Output:

[4, 3]
[10, 5, 5, 10]

The obvious answer for the second case is [10, 10] as that would sum to 20 with the least number of elements, also for the first case the JavaScript output is [3, 4] whereas python output is [4, 3], isn't it strange?

EDIT: Someone marked this question as duplicate, i followed that guide and used a placeholder in place of the mutable default argument, but the output is still the same, what is wrong now?