radiobutton hovering bug that cannot be solved by preventing it from garbage collection tkinter

I was going through some code and came across this one, where while hovering the mouse over the radiobuttons, the Checkbutton gets selected, I have tried keeping a reference to variable(shouldn't be needed as is already global), but it fails.

Here is the code:

from tkinter import *

root = Tk()

text_colors = ['1','2','3','4','5','6','7','8']
rads = []
for i in range(4):
    for j in range(2):
        col = text_colors.pop()
        val = IntVar()
        root.garbage_saver = val
        rads.append(Radiobutton(root,text=col,fg='red',variable=val))
        rads[-1].grid(row=i,column=j)

root.mainloop()

This bug is reproducible on my Windows 10, Python 3.9