Hello, no need to wipe anything but I highly recommend to flash the latest TWRP version for your device before updating the ROM.
Latest TWRP for Mi 9T Pro is available here =>
https://androidfilehost.com/?fid=2188818919693777991
Download it on your phone then you can directly flash this new TWRP from your current TWRP:
Boot to your current TWRP => Go in "Install" menu => Tap on "Install Image" button => Find and tap on the new TWRP image and select "Recovery" partition => Swipe to flash it and it's done.