如何修复第一人称射击控制器中相机自动归位问题？

• 制作第一人称射击控制器时，相机调整到指定位置后会自动回到角色中心，移动相机后也会重置到默认位置
• 已尝试手动调整相机至正确位置，但仍会自动修正到角色中心；也尝试创建序列化字段手动分配相机，问题未解决

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

public class Shooter_Controller : MonoBehaviour
{
    public GameObject bulletPrefab;
    public Transform shootingPosition;
    public Transform aimDownSightsPosition;
    [SerializeField] private Camera mainCamera;

    public float shootingRate = 0.1f;
    public float bulletSpeed = 10f;

    public float aimDownSightsSpeed = 5f;
    public float defaultFov = 90f;

    private float shootingTimer = 0f;
    private bool isAiming = false;

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        shootingTimer += Time.deltaTime;

        //射击机制
        if(Input.GetButtonDown("Fire1") && shootingTimer > shootingRate)
        {
            GameObject bullet = Instantiate(bulletPrefab, shootingPosition.position, Quaternion.LookRotation(mainCamera.transform.forward));
            Rigidbody bulletRigidBody = bullet.GetComponent<Rigidbody>();
            bulletRigidBody.velocity = mainCamera.transform.forward * bulletSpeed;
            shootingTimer = 0f;
        }

        //瞄准机制
        isAiming = Input.GetButton("Fire2");

        if (isAiming)
        {
            mainCamera.fieldOfView = Mathf.Lerp(mainCamera.fieldOfView, defaultFov / 2f, aimDownSightsSpeed * Time.deltaTime);
            mainCamera.transform.localPosition = Vector3.Lerp(mainCamera.transform.localPosition, aimDownSightsPosition.localPosition, aimDownSightsSpeed * Time.deltaTime);
        }
        else
        {
            mainCamera.fieldOfView = Mathf.Lerp(mainCamera.fieldOfView, defaultFov, aimDownSightsSpeed * Time.deltaTime);
            mainCamera.transform.localPosition = Vector3.Lerp(mainCamera.transform.localPosition, Vector3.zero, aimDownSightsSpeed * Time.deltaTime);
        }
    }
}

内容的提问来源于stack exchange，提问作者Daniel A