Doesn't work .count, pls help

Getting Started
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1

I have a code, there is a part of it:

public List<Rigidbody2D> caughtRigidbodies = new List<Rigidbody2D>();

void OnTriggerEnter2D(Collider2D other)
{
    if (other.GetComponent<Rigidbody2D>() && other.gameObject.CompareTag("mag"))
    {
        Rigidbody2D r = other.GetComponent<Rigidbody2D>();
        if (caughtRigidbodies.Count < 20)
        {
            if (!caughtRigidbodies.Contains(r))
            {
                caughtRigidbodies.Add(r);
            }
        }
    }
}

With some reason this code add new elements in list even if the list has more then 20 objects.
How can I fix it?
Sry by my english, it’s not my native language.

edit: at first i have wrote it like

            if (!caughtRigidbodies.Contains(r) && caughtRigidbodies.Count < 20)
            {
             }

But this didn’t work(

2

Is this script only on one gameobject. (Not prefab)

3

No, actually it’s on 200 objects… Why?

4

then the list is per object… so each object would need to get to 20 before it stops adding to its copy of the list

5

How can I fix it?

6

well it depends a bit on what exactly it is you are trying to achieve…