QApplication not exiting on lastWindowClosed

Python 3.7 just came out! Good thing: PySide2 seems to work with it fine just like on 3.6.5 but:

The apps processes keep running. They aren't shutting down.

for example:

C:/Python36/Lib/site-packages/PySide2/examples/widgets/dialogs/extension.py

• pops up
• you close it
• terminated, exit value: 0

C:/Python37/Lib/site-packages/PySide2/examples/widgets/dialogs/extension.py

• pops up
• you close it
• process keeps running

I tried the Pre-release wheels from http://download.qt.io/snapshots/ci/pyside/5.11/latest/pyside2/ [via