Clarification on System is Destroyed Issue :

Full Credits go to @cyanred21 & @rockyanexpert

Just to clear some confusion people seem to be having:

For Raphaelin users (Indian K20 Pro): New builds will turn out to be destroying systems if you come directly from any builds before 3rd February 2021 or AOSP. You will have to unlock the Bootloader in order to use the device with the new ROM. (Unlocking won't wipe your data). If you come from builds after 3rd February 2021, only dirty flashing the new builds will not have any issue. Clean flashing again causes the issues.
Also, after being on the new builds, if you decide to move to AOSP in future, you will again face the system destroyed issue and will have to unlock the Bootloader again. The procedure remains the same for that too, just unlock and no data wipes.

For Raphael users (Global or China Mi9T Pro): No system destroyed issue.

Also, if you get the classic "System Destroyed" error after flashing the new builds, there's hardly any reason to panic.
You won't have no problems unlocking if you use the same Mi Account to unlock it with which you unlocked it the very first time. Use the provided Xiaomi Tool V2 from the group and things will be just fine.

Full Credits go to @cyanred21 & @rockyanexpert