I found the reason! There was an NPC in giran who had a skin from id 29056 Ice Fairy Sirra. (I don't know, it's only in RT builds that he's so buggy or in all the others too). With him, the crit immediately flew out with an error. It was worth replacing his idTemplate with any other one, and THE PROBLEM WAS SOLVED! It stopped flying out with an error! And this is after so many years of suffering and losses... PROFIT!