Animation is delayed after few play attemps even though all transition times' are zero

Hi, I am trying to play animation forward and backward when player press the same button again and again. I have a straight line and I want to convert it to 8 while moving it. I want to play animation backward or forward from the exact frame where I pressed the button again.

When I pressed the button, animation starts playing and moving and If I pressed the button again in the middle of animation it is played backward from the exact frame. However, after a few try my animation starts playing with a delay or it stops playing completely.

I am sending speedMultiplier parameter to make the speed -1 to play backward my animation.

Code (CSharp):

1.     private Animator eightAnimator;
2.     private bool isLine;
3.     private bool isMoving;
4.     private bool becomingEight;
5.     private bool becomingLine;
6.  
7.     private Vector3 nextPosition;
8.     private Vector3 startPosition;
9.  
10.     // Start is called before the first frame update
11.     void Start()
12.     {
13.         isMoving = false;
14.         isLine = false;
15.         becomingEight = false;
16.         becomingLine = false;
17.         eightAnimator = GetComponent<Animator>();
18.  
19.         startPosition = this.transform.position;
20.     }
21.  
22.     // Update is called once per frame
23.     void Update()
24.     {
25.         if(Input.GetKeyDown(KeyCode.M))
26.         {
27.             eightAnimator.SetBool("isMoving", true);
28.  
29.             if (isLine)
30.             {
31.                 isMoving = true;
32.                 isLine = false;
33.                 becomingEight = true;
34.                 becomingLine = false;
35.                 nextPosition = new Vector3(this.transform.position.x + 6, this.transform.position.y, this.transform.position.z);
36.                 eightAnimator.SetFloat("speedMultiplier", 1f);
37.                
38.             } else
39.             {
40.                 isMoving = true;
41.                 isLine = true;
42.                 becomingLine = true;
43.                 becomingEight = false;
44.                 eightAnimator.SetFloat("speedMultiplier", -1f);
45.             }
46.  
47.         }
48.  
49.         if(becomingEight)
50.         {
51.             this.transform.position = Vector3.MoveTowards(this.transform.position, nextPosition, Time.deltaTime * 10);
52.  
53.             if (Vector3.Distance(nextPosition, this.transform.position) < 0.01f)
54.             {
55.                 isMoving = false;
56.                 becomingEight = false;
57.                 eightAnimator.SetBool("isMoving", false);
58.             }
59.         }
60.  
61.         if(becomingLine)
62.         {
63.             this.transform.position = Vector3.MoveTowards(this.transform.position, startPosition, Time.deltaTime * 10);
64.  
65.             if (Vector3.Distance(this.transform.position, startPosition) < 0.01f)
66.             {
67.                 isMoving = false;
68.                 isLine = true;
69.                 becomingLine = false;
70.                 eightAnimator.SetBool("isMoving", false);
71.             }
72.         }
73.  
74.     }

I am adding here unity package, video, screen shot and my simple code.

So how can I play my animation when I pressed the button with the exact frame and exact time without delay?