https://www.theregister.co.uk/2019/10/17/samsung_galaxy_s10_note_10_fingerprint_bypass/

Samsung is investigating a critical issue with its Galaxy S10 and Note 10 smartphones after reports that it fails to discriminate between different fingerprints if a screen protector is fitted.

The Galaxy S10 features what Samsung calls "a revolutionary new biometric authentication feature... an in-display fingerprint sensor fused into the Infinity-O Display, providing invisible yet vault-like security that keeps your data safe... it sends ultrasonic pulses to detect the 3D ridges and valleys of your unique fingerprint."