When creating the Python Tkinter GUI, icon files cannot be read correctly after setting the icon image twice.

During the GUI creation procedure for the tkinter library, when setting the window icon,
What is wrong with the image loading error when I write down the icon specification twice?
Usually, it is said that you should not specify it twice, but the build fails after passing through.
I don't get an error code, so I don't know why.

i icon.ico is located directly under the directory in the relative path and is referenced directly under the directory in the cd configuration when running at the anaconda prompt.

#Normal Example
import tkinter as tk
root=tk.Tk()
root.title ('Window Name')        
root.geometry ('300x200')
root.iconbitmap(default='icon.ico')
root.mainloop()

# a bad example
import tkinter as tk
root=tk.Tk()
root.title ('Window Name')        
root.geometry ('300x200')
root.iconbitmap(default='icon.ico')
root.iconbitmap(default='icon.ico')
root.mainloop()