давайте короче скопируем метод из ваниллы не особо разбираясь зачем он нам нужен, ПОХУЙ ЧТО АЙРОНЧЕСТЫ НИКОГДА НЕ БЫВАЮТ СДВОЕННЫЕ.

src/main/resources/META-INF/coremods.json

@@ -1,5 +1,6 @@
 {
   "code_injector": "coremods/code_injector.js",
   "chest_menus": "coremods/chest_menus.js",
-  "limb_brush_overclock": "coremods/limb_brush_overclock.js"
+  "limb_brush_overclock": "coremods/limb_brush_overclock.js",
+  "iron_chest_menus": "coremods/iron_chest_menus.js"
 }

src/main/resources/coremods/iron_chest_menus.js

@@ -0,0 +1,45 @@
+
+var Opcodes = Java.type('org.objectweb.asm.Opcodes')
+var MethodNode = Java.type('org.objectweb.asm.tree.MethodNode')
+var VarInsnNode = Java.type('org.objectweb.asm.tree.VarInsnNode')
+var MethodInsnNode = Java.type('org.objectweb.asm.tree.MethodInsnNode')
+var InsnNode = Java.type('org.objectweb.asm.tree.InsnNode')
+var TypeInsnNode = Java.type('org.objectweb.asm.tree.TypeInsnNode')
+
+
+var isOwnPatches = [
+	'com.progwml6.ironchest.common.block.regular.entity.AbstractIronChestBlockEntity$1',
+]
+
+function initializeCoreMod() {
+	var result = {}
+
+	for (i in isOwnPatches) {
+		var clazz = isOwnPatches[i]
+
+		result[clazz] = {
+			'target': {
+				'type': 'METHOD',
+				'class': clazz,
+				'methodName': 'isOwnContainer',
+				'methodDesc': '(Lnet/minecraft/world/entity/player/Player;)Z'
+			},
+			'transformer': function(node) {
+				for (var i = 0; i < node.instructions.size(); i++) {
+					var instr = node.instructions.get(i)
+
+					if ((instr.getOpcode() == Opcodes.INSTANCEOF || instr.getOpcode() == Opcodes.CHECKCAST) && instr.desc == 'com/progwml6/ironchest/common/inventory/IronChestMenu') {
+						instr.desc = 'ru/dbotthepony/mc/otm/compat/ironchest/MatteryIronChestMenu'
+					} else if (instr.getOpcode() == Opcodes.INVOKEVIRTUAL && instr.owner == 'com/progwml6/ironchest/common/inventory/IronChestMenu' && instr.name == 'getContainer') {
+						instr.owner = 'ru/dbotthepony/mc/otm/compat/ironchest/MatteryIronChestMenu'
+						instr.name = 'getContainer'
+					}
+				}
+
+				return node
+			}
+		}
+	}
+
+	return result
+}