There is no difference between a cop pressing a finger against a fingerprint reader to unlock a phone to gather evidence, and a cop pressing a finger against an inkpad (or scanner) to collect a fingerprint to compare to one found on an object or surface found at a crime scene.

If law enforcement suspects your fingerprints are on a crowbar found at the scene of a bank robbery, they tell a judge, present their evidence, and get a court order for you to press your finger on a fingerprint scanner.

If law enforcement suspects your fingerprint will unlock your phone and your phone as evidence of a crime on it, they tell a judge, present their evidence, and get a court order for you to press your finger on a fingerprint reader.

Nothing is broken.