ArrowSpawner.cs

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

public class ArrowSpawner : StateMachineBehaviour
{
    [SerializeField] GameObject arrowPrefab;
    GameObject arrow;

    public override void OnStateEnter(Animator animator, AnimatorStateInfo stateInfo, int layerIndex)
    {
        if (stateInfo.IsName("shoot"))
        {
            int directionArrow = 1;
            if (animator.gameObject.transform.localScale.x < 0f)
            {
                directionArrow = -1;
            }
            Vector2 spawnPos = animator.gameObject.transform.position;
            Debug.Log("Bevor:" + spawnPos.ToString());
            spawnPos += new Vector2(1 * directionArrow, 0);
            Debug.Log("After:" + spawnPos.ToString());

            arrow = Instantiate(arrowPrefab,spawnPos,Quaternion.identity);
            ChangeArrowDirection(arrow,directionArrow);
        }
    }

    void ChangeArrowDirection(GameObject arrow, int directionArrow)
    {
        arrow.transform.Rotate(0, 0, 90 * directionArrow);
        
    }
}