Why doesn't half of the clicks work?

Question

Unity

Like half of the clicks do not work, or will I release my finger, and he continues to think that he is on the screen?

using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class Submarine : MonoBehaviour
{
    [Header("Settings")]
    [SerializeField] private float _speed;
    [SerializeField] private float _rotationSpeed;

    [Header("Components")]
    [SerializeField] private Rigidbody _rigitbody;

    private int _leftTouchId;
    private int _rightTouchId;

    private int _halfScreen;

    private void Awake()
    {
        _halfScreen = Screen.width / 2;

        _leftTouchId = -1;
        _rightTouchId = -1;
    }

    private void FixedUpdate()
    {
        GetTouchInput();

        if(_leftTouchId != -1)
        {
            RotateSubmarine();
        }

        if(_rightTouchId != -1)
        {
            MoveSubmarine();
        }
    }

    private void RotateSubmarine()
    {
        transform.Rotate(Vector3.forward, _rotationSpeed * Time.fixedDeltaTime);
    }

    private void MoveSubmarine()
    {
        _rigitbody.velocity = transform.right * _speed * Time.fixedDeltaTime;
    }

    private void GetTouchInput()
    {
        for (int i = 0; i < Input.touchCount; i++)
        {

            Touch touch = Input.GetTouch(i);

            switch (touch.phase)
            {
                case TouchPhase.Began:

                    if (touch.position.x < _halfScreen && _leftTouchId == -1)
                    {
                        // Start tracking the left finger if it was not previously being tracked
                        _leftTouchId = touch.fingerId;
                        Debug.Log("Start left");
                    }
                    else if (touch.position.x > _halfScreen && _rightTouchId == -1)
                    {
                        // Start tracking the rightfinger if it was not previously being tracked
                        _rightTouchId = touch.fingerId;
                        Debug.Log("Start right");
                    }

                    break;
                case TouchPhase.Ended:
                case TouchPhase.Canceled:

                    if (touch.fingerId == _leftTouchId)
                    {
                        // Stop tracking the left finger
                        _leftTouchId = -1;
                        Debug.Log("Stopped tracking left finger");
                    }
                    else if (touch.fingerId == _rightTouchId)
                    {
                        // Stop tracking the right finger
                        _rightTouchId = -1;
                        Debug.Log("Stopped tracking right finger");
                    }

                    break;
            }
        }
    }

}

Answer 1

Because FixedUpdatethey don't work.