Does a window appear for a fraction of a second before opening the main tkinter window?

Question

Python

The problem is that when you start the program, a window appears on top in the corner for a fraction of a second (not the console, but the tkinter window, although in fact it is only one created).

The file with the code was uploaded here (all the code does not fit here): https://my-files.su/eiipa2

Answer 1

I removed the line with the icon and this window stopped appearing. It turns out because of the icon? But why? UPD: I asked myself, I answered myself. In general, all of a sudden someone will have the same problem, changed the line of code that is higher to thiswindow.iconbitmap('favicon.ico')

window.iconphoto(True, tk.PhotoImage(file = 'favicon.png'))

and the window no longer appears.