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I've gotten a couple reports from users, along these lines... > Having problems with glass panes not being visible in inventory when running 1.12.2 under forge, not sure when this started but was before 2555 i think. Not just me. Thx. This is in refers to the resource pack, Lithos:Core v1.16 for 1.12x. I've confirmed the problem exists for forge1.12.2-14.23.1.2555 https://www.curseforge.com/minecraft/texture-packs/lithos-core-32x-1-6-1-11-complete/files The display problem is only with item icons in the GUI They are completely invisible. Items on the ground or in the hand display as normal.

ItemStackHandler#onContentsChanged is called when the contents of an ItemStackHandler change, you can extend ItemStackHandler (possibly in an anonymous class inside your TileEntity) and override this to do you what you need.