[Python] TkInter Button Unpressable - No Errors Raised, Not Disabled

I was working with tkinter in OOP, and I came across an odd bug: the button here goes completely unresponsive, despite being fully active and the mainloop running:

import tkinter as tk

def main():
global root, button
root = tk.Tk()
pixel = tk.PhotoImage(width=1, height=1)
button = tk.Button(root, text="Hmm",
image=pixel,
compound="c")

button.pack()

main()
root.mainloop()


I used the hidden image as I need to set the specific pixel height and width of the button, but when I remove the image=pixel the button works fine.

This button is unpressable, both with mouse and with tab+enter:



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