Disabling the Expanded Item Interactions on server but not on client makes ghost items when you use the feature to equip armor from chests or other inventories, some of this ghost items can affect the player even if they shouldn't, a good example of this is that equipping a ghost backpack will lock the player out of it's inventory till re-log or die (or swap with another chestplate I guess).

This module should probably handshake with the client.

Any news on this? This unfortunately breaks all shops that use the vanilla gui to not require any extra installs to modpacks. I unfortunately don't know my way around Quark and Zeta enough to fix it myself.