Python Tkinter canvas.scale() does not scale images while running

I am new with Tkinter, and could not find any answers on why the scaling does not work.

I have a script that moves and zooms on an image while the window is running. The movement works perfectly, although canvas.scale() doesn't do anything.

Here is a snippet:

def GetAttrPositions(char, attrs):
    global pos
    pos = [10,10,1]
    root = tk.Tk()
    root.title('Getting Attribute Positions')
    root.geometry(f"{char_base.size[0]}x{char_base.size[1]}")

    canvas = tk.Canvas(root, width=2000, height=2000)
    canvas.pack()

    char = tk.PhotoImage(file=f"assets/Chars/{char}.png")
    char_image = canvas.create_image(0,0, anchor=tk.NW, image=char)
    attr = tk.PhotoImage(file=f"assets/Attr/{attrs[0]['Type']}/{attrs[0]['Name']}.png")
    attr_image = canvas.create_image(pos[0], pos[1], anchor=tk.NW, image=attr)
    
    def move(event):
        global pos
        if event.char == "a":
            print('a')
            pos[0] -= 2
            canvas.move(attr_image, -2, 0)
        elif event.char == "d":
            print('d')
            pos[0] += 2
            canvas.move(attr_image, 2, 0)
        elif event.char == "w":
            print('w')
            pos[1] -= 2
            canvas.move(attr_image, 0, -2)
        elif event.char == "s":
            print('s')
            pos[1] += 2
            canvas.move(attr_image, 0, 2)
        elif event.char == "x":
            print('x')
            pos[2] = pos[2]*2
            canvas.scale(attr_image, pos[0], pos[1], 2, 2)
        elif event.char == "z":
            print('z')
            pos[2] = pos[2]/2
            canvas.scale(attr_image, pos[0], pos[1], 0.5, 0.5)

    root.bind("<Key>", move)
    root.mainloop()

P.S. I am sure that it is working, as if I put a wrong offset, then the image moves, but does not scale