Programmatically does not close PyWebview running GTK

Specification

• pywebview version: 3.4
• platform / version: Ubuntu 20LTS and OSX Catalina 10.15.7

Description

I have a shutdown button on the application. Previously running QT the following would work for shutdown:

def shutdown():
    utils.kill_other_processes()
    time.sleep(0.5)
    os._exit(0)

Since switching to GTK this procedure no longer works. I tried to destroy as follows:

def shutdown():
    from app import window
    window.destroy()
    utils.kill_other_processes()
    time.sleep(0.5)

It raises the following warning:

PyObjC: Exception during dealloc of proxy: Completion handler passed to -[BrowserDelegate webView:runJavaScriptConfirmPanelWithMessage:initiatedByFrame:completionHandler:] was not called

How would I call this delegate method with the API or is there something wrong with my procedure?

[aug2uag]

the examples file destroys the window-- on mine, window is destroyed with qt no problem, gtk raises the pyObjC message

the examples creates a hang on same machine that can’t close gtk though, program doesn’t end with SIGINT

% python deswindow.py 
Destroying window..
Destroyed!
^C^C

^C^C^C

[PlumpMath]

Me too… I can’t close the window. MacOS monterey intel How can I get back to the terminal console?