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In my case 'preview_OptiFine_1.12.2_HD_U_C8_pre' prior to 12-18-2017 was causing chests not to open. I DL'd the 12-18-2017 version that is compatible with forge 2577 and the chests open as before.

To damage the itemstack, call ItemStack::damageItem instead. It automatically handles breaking when durability <= 0 & deals with statistics as well. You also need to provide an empty Set<Block> instead of null when instantiating your ItemCarvingTool.

I've got some tutorial information as well as links to others here: http://jabelarminecraft.blogspot.com/p/minecraft-17x.html Note that part of the confusion is that there are actually four fairly different situations related to capabilities: Using existing capabilities (e.g. IItemHolder) in your custom classes Using custom capabilities in your custom classes Using existing capabilities on vanilla (or other mod's) classes Using custom capabilities on vanilla (or other mod's) classes I think people get confused because often a tutorial will be covering a case different than yours and so if you apply it you'll either be missing something needed or will duplicate something unnecessary.