What should I do to debug in Collision Detection?

Question

There is a big bug in this script in Unity that I wanted to ask before changing the functions, is there an easier way to fix this bug? It is a simple game that if the ball hits the cylinder in the middle of the field for 5 seconds, the first cylinder will come down and the player will win. The bug is that if the ball hits the cylinder in a very short time and returns very quickly, the ground will not notice and the timer will continue and after 5 seconds the cylinder will come down and win.

void OnCollisionEnter(Collision collision)
{
    if (collision.gameObject.CompareTag("Cylinder"))
    {
        collisionTime = Time.time;
        timerActive = true;
        cylinderObject = collision.gameObject;
    }
    else if (collision.gameObject.CompareTag("Ground"))
    {
        timerActive = false;
        UpdateTimerText();
    }
}

void Update()
{
    if (timerActive && Time.time - collisionTime > collisionThreshold)
    {
        restarting = true;

        if (cylinderObject != null)
        {
            Vector3 newPosition = cylinderObject.transform.position;
            newPosition.y -= 2f;
            cylinderObject.transform.position = newPosition;                
            timerActive = false;               
        }
        
        StartCoroutine(RestartGameAfterDelay(restartDelay));
    }

    UpdateTimerText();
}

IEnumerator RestartGameAfterDelay(float delay)
{
    yield return new WaitForSeconds(delay);
    SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
}

void UpdateTimerText()
{
    if (restarting)
    {
        timerText.text = "";
        return;
    }

    if (timerText != null)
    {
        float remainingTime = Mathf.Max(0f, collisionThreshold - (Time.time - collisionTime));

        if (timerActive)
        {
            timerText.text = $"Time: {remainingTime:F1}s";
        }
        else
        {
            timerText.text = "";
        }
    }
}

}