Hello OregonCore Community.
I found that OregonCore has "Data Overflow" or some other people call it infinite loop as well ( I don't understand what's that, but anyways ). I've added 15 000 items and server stopped at loading items. By deleting items it changes his "stuck" position until it reach under the limit and then it works. Adding items is as same as creating another data info like "Creatures" "Quests" etc. There is "Data Overflow" as I wrote minutes ago in the subject. In fact, I just think that this is the problem, but who knows?