How does new PDR work?

Even if the new UI update which calculates damage/stat changes shows multiplicative PDR values, that does not necessarily mean we got the corresponding code for calculating actual damage. This weird mismatch of KMS+CMS+GMS code could do anything... and Nexon employees themselves may not fully understand it judging by our grossly incomplete update notes.

I'll do some rigorous testing using my BM damage calculator which was highly accurate pre-Unleashed and see if there are any inconsistencies.