Reverting pywebpush to 1.6.0 works for me so far.
To revert the pywebpush version, you can just create a folder called “html5” inside your custom components folder and copy all the files from here https://github.com/home-assistant/home-assistant/tree/dev/homeassistant/components/html5 into this folder
Then modify the “manifest.json” file and change pywebpush==1.9.2 to pywebpush==1.6.0 and restart hass.