Fix bug in object equality check

storage/itemstack.lua

@@ -256,7 +256,7 @@ end
 local function checkEqual(obj1, obj2, funcName)
   local result1 = { runGetter(obj1, funcName) }
   local result2 = { runGetter(obj2, funcName) }
-  return result1[1] and result2[2] and (result1[2] == result2[2])
+  return result1[1] and result2[1] and (result1[2] == result2[2])
 end
 
 local function checkEnchantments(obj1, obj2)