Re: ULMF Minecraft Server
Best advice regarding chests eating items due to lag is simply to be careful and use steady deliberate clicks with any valuable items. Move them over more slowly, and make sure that the icon has registered before moving anything else. It doesn't need to be too long, but provided you give it enough time before the next item move it shouldn't ever delete anything. If the icon for the chest is blinking out for longer than usual at any one time, that's a sign you risk losses if placing too fast.
Same aplies when placing rare blocks. If you try to put a lot down at once and a lag spike hits at that moment, it's more likely to make a mistake.