Unity - BoxCollider2D - Why does an object collide with itself?

Question

2D

The code:

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

public class EnemyScript : MonoBehaviour
{
    [Header("Объекты")]
    [SerializeField] public GameObject tower;
    [SerializeField] public GameObject prefabBullet;

    [Header("Параметры")]
    [SerializeField] public float moveSpeed;
    [SerializeField] public float rotateSpeed;
    [SerializeField] public float towerSpeed;
    [SerializeField] public float bulletSpeed;
    [SerializeField] public float easyReloadTime;
    [SerializeField] public float maxViewDistance;

    bool ready = true;
    RaycastHit2D raycast;
    PlayerScript player;

    private void Awake()
    {
        player = FindObjectOfType<PlayerScript>();
    }

    void Update()
    {
        //Move();
        RotateTower();
        Raycast();
    }

    void Move()
    {
        if (true)
        {
            transform.position += new Vector3(transform.up.x * moveSpeed * Time.deltaTime, transform.up.y * moveSpeed * Time.deltaTime, 0);
        }
        else if (true)
        {
            transform.position -= new Vector3(transform.up.x * moveSpeed * Time.deltaTime, transform.up.y * moveSpeed * Time.deltaTime, 0);
        }
        if (true)
        {
            transform.rotation = Quaternion.Euler(0, 0, transform.rotation.eulerAngles.z + rotateSpeed * Time.deltaTime * 180);
            tower.transform.rotation = Quaternion.Euler(0, 0, tower.transform.rotation.eulerAngles.z - rotateSpeed * Time.deltaTime);
        }
        else if (true)
        {
            transform.rotation = Quaternion.Euler(0, 0, transform.rotation.eulerAngles.z - rotateSpeed * Time.deltaTime * 180);
            tower.transform.rotation = Quaternion.Euler(0, 0, tower.transform.rotation.eulerAngles.z + rotateSpeed * Time.deltaTime);
        }
    }

    void RotateTower()
    {
        tower.transform.rotation = Quaternion.Euler(0, 0, Mathf.Atan2(player.transform.position.y - transform.position.y, player.transform.position.x - transform.position.x) * 180 / Mathf.PI - 90);
    }

    void Shoot()
    {
        if (ready)
        {
            GameObject clone = Instantiate(prefabBullet, tower.transform.position, tower.transform.rotation);
            clone.AddComponent<BulletScript>();
            clone.GetComponent<BulletScript>().speed = bulletSpeed;
            clone.GetComponent<BulletScript>().type = false;
            ready = false;
            StartCoroutine(EasyReload());
        }
    }

    IEnumerator EasyReload()
    {
        yield return new WaitForSeconds(easyReloadTime);
        ready = true;
    }

    //Проблемный Участок Кода
    void Raycast()
    {
        raycast = Physics2D.Raycast(new Vector3(transform.position.x + transform.up.x * 4, transform.position.y + transform.up.y * 4, transform.position.z), player.transform.position, maxViewDistance);
        if (raycast) 
        {
            if (raycast.collider.gameObject.tag == "Player")
            {
                Shoot();
            }
        }
    }
}

Installed Parameters:

Answer 1

If it is correct then Raycast comes from the center of the object, and it immediately crashes into its own collider. Accordingly, the point from which the beam is sent must be moved outside the collider. You have the opposite situation, the beam is sent from somewhere outside with an offset, to the center of our object. From which the conclusion follows that if there are no other colliders between the point where the beam comes from and to the center of the character, then it hits the character.
Solution:
- Draw the beam through Debug.DrawRay or Debug.DrawLine (something like that and set the correct offset of the end point).
- Experimentally find suitable values.
- Create 2 additional GOs in the character and use them as the end and start points of the beam.