Armadillotek, a company that makes heavy-duty mobile device accessories, claims to have a Samsung Galaxy S10 unit in-house in order to make a case from its Vanguard series for the phone. It asserts that the screen protector that comes built into this model is incompatible with the fingerprint scanner found on the upcoming flagship.
https://www.notebookcheck.net/Casemaker-claims-the-Galaxy-S10-line-s-fingerprint-sensor-will-not-work-with-its-screen-protectors.395771.0.html