Reproduced both in Chrome and Firefox.
Chrome Version 80.0.3987.149 (Official Build) (64-bit)
Firefox 74.0 (64-bit)
OS:
Ubuntu 19.10
Tried in incognito mode as well, without any extensions and same outcome.
Adding a short video to demonstrate:
- There are no console errors.
- There are no errors in admin logs (yoursite.com)
I found this post later: Discourse Push Notifications for Desktop - #49 that describes a similar issue