Steps to reproduce:
- Boot from GNOME Live image (I'm using https://downloads.pureos.net/live/gnome/2019-09-26/)
- Configure wifi as part of the live system process
- Install PureOS to your harddisk
- Boot into this new installed/hardisk PureOS version
- Be asked to re-enter wifi password etc.
This is a little annoying as this wifi password is rather complicated and error-prone to add. It's also a little disjointed as it "remembers" your keyboard/locale options, etc.