[QUESTION] - how to reset radio buttons to False?

Question

windows 10

3.7

3.28

import PySimpleGUI as sg

layout = [[sg.Radio('No.1', "RADIO1", key='r1'),
           sg.Radio('No.2', "RADIO1", key='r2'),
           sg.Radio('No.3', "RADIO1", key='r3')],

          [sg.Button('Reset'), sg.Button('List'), sg.Button('Exit')]]

window = sg.Window('Reset Buttons', font=("Helvetica", 12)).Layout(layout)

while True:
    event, values = window.Read()
    if event is None or event == 'Exit':
        break
    if event == 'List':
        sg.Popup(values)
    if event == 'Reset':
        window.FindElement('r1').Update(False)
        window.FindElement('r2').Update(False)
        window.FindElement('r3').Update(False)

I'm sure this is a simple thing but if I'm new to programming and I'm struggling to get some radio buttons to reset back to False. the above code is what I have been using as a test.
After ticking a radio button and pressing the reset button intead of the selected button being deselected (becoming false) what happens is radio button r3 becomes true.

Where am I going wrong?

Start with the radio-button example in the issue body and reproduce it using Python 3.7, PySimpleGUI 3.28, and Windows 10. Inspect the Reset handler and the Radio element's update behavior; the work is done when pressing Reset leaves r1, r2, and r3 all set to False.