rabidus-test/Assets/DisableAfterFinish.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DisableAfterFinish : MonoBehaviour
{
    private DisableAfterFinishController disableController;

    private void Awake()
    {
        disableController = FindObjectOfType<DisableAfterFinishController>();
    }

    private void OnEnable()
    {
        disableController.DoDisable += Disable;
    }

    private void OnDisable()
    {
        disableController.DoDisable -= Disable;
    }

    private void Disable()
    {
        gameObject.SetActive(false);
    }
}