This happens to me too. I'm fairly certain that every Chromium based browser is involved, and maybe even Firefox, and the issue happens when the browser updates.Having an issue that started with this beta. Google Chrome loses ability to access local network. Toggling privacy permissions doesn't fix the problem. Inactivating ethernet port and activating again doesn't fix it. Restarting the computer always fixes it.
The new binary simply loses its permission to access the local network. Reboot fixes the permission.
Safari is not involved simply because it gets updated with the system.