For now there is no ROM for Redmi 4X santoni with android 10 with working goodix fingerprint sensor. we should soon see working Goodix fingerprint sensor for Redmi 4X santoni with android 10.
I have tried android 10 based havoc os and for me fingerprint sensor worked and i have check with my phone i have FPC fingerprint sensor.
to check which fingerprint sensor my phone has i used app from google play store called Device Info HW before flashing ROM.(root not required)