Me and a friend of mine are playing together on an LAN world.
When we made some drawers most items stacked correctly in the drawers but there are some items like for example carrots that do not stack correctly with a mixture of maximums like; 744 or 851 as a max. Keep in mind this happenend in a LAN server world (hosted by me using Hamachi, I know this is not the best way).

P.S. the item Conversion Upgrade also does not work correctly. Whe have multiple different coppers or tins in our modpack but some metals won't convert like Lead and Silver from other mods. (We can convert them by hand and a crafting table with nuggets or blocks)