The Nokia 9 PureView's in-display fingerprint reader has been the subject of many a debate, and the company has sent out OTAs that were supposed to improve it. A new video, however, shows a Nokia 9 PureView being unlocked by an unregistered fingerprint, and a packet of chewing gum afterwards. And no, we're not making this up.
https://www.notebookcheck.net/The-Nokia-9-PureView-s-fingerprint-sensor-can-apparently-be-unlocked-by-just-about-everything-including-chewing-gum.418577.0.html
Seems to be an issue with this specific device or a hoax as none other nokia 9 owners (including myself) are able to replicate this behavior.