FixmePlzz its rebooting as many times until it works AND stopping there
yeah... that's a hardware issue. When the fingerprint scanner fails initialization (like POST for BIOS/UEFI systems), it is not recognized by the system, since it's being declared missing.
Good news is - you can replace the scanner standalone without replacing the display.
Hit up a local repair shop, they should be able to give you a quote. Or, if you have some experience with smartphone repairs, you can of course do it yourself.