It is confirmed that when a map server is down, the data of that map server will be drawn back a little bit.
I once purchased an item from a vending store in prontera right before prontera is down. After I am able to log on again, the item disappeared. I am not sure how long this window is - maybe one minute - but the data is definitely drawn backwards.
If someone can cause a map server to go down, or know when it will go down, that person can duplicate items.
Based on the finding above, if someone has items in charater A, giving all the items to charater B, and character B leaves the map server, and then map server where A stands goes down. Character A's inventory will be resumed back and charater B keeps the items as well - the items are duplicated.
Look at our market now.
Someone from Discord market place is suddenly selling a lot of "best enchant" shadow gears, which requires a large amount of enchant boxes that was not sold by WP for a very long time - well this is only "very suspicious" and I can't confirm if they are legit or not.
However same person also selling "Finest Weapon Modification Device (Physical)" in Prontera for 16m each right now (Feb 27th, 2023 server time). This is an in-game produced item. You have a 5% chance to draw it with a cost of 1m per draw. Which means for every 20m he spent, he gets one items that sells for 15.2m (after tax). He is not selling any other "side products" from the draw so his zeny only comes back from the sale of the 5% product. He has been doing this for half a year now with about 100 billion zeny in sale so I don't trust his "good luck" in this much quantity. Last weekend alone the sale was greater than 3b.
Not to mention other items that are very likely to be duplicated and sold in the same store, like Seagod's Anger, etc.
Look at how frequent our forum has posts about server down.
You can see this yourself with just one click.
Sending a ticket confirms those items are legit.
I bought one of the modification devices that is definitely duplicated, but the ticket confirms it is legit. I am not sure how item verifications are done now and GM won't release the method. I guess that's why these people can duplicate so much without any concerns about their accounts.
I am not logging on as much any more.
It just feels stupid to hunt MVPs or mobs and someone else just duplicate stuff and gets a lot more than you do. I am pretty sure some others feel the same.
Not sure how to get more attention to this but it is definitely destroying our server.