Use the same method for getting BlockChest, when checking whether AnyChest is needed due to the side block as in d0494aa2

src/main/java/com/lishid/openinv/internal/v1_8_R1/AnySilentChest.java

@@ -35,7 +35,8 @@ public class AnySilentChest implements IAnySilentChest {
         BlockPosition position = new BlockPosition(x, y, z);
         EntityPlayer player = ((CraftPlayer) p).getHandle();
         World world = player.world;
-        BlockChest chest = (BlockChest) Block.getByName("chest");
+        BlockChest chest = (BlockChest) (((BlockChest) world.getType(position).getBlock()).b == 1 ?
+                Block.getByName("trapped_chest") : Block.getByName("chest"));
 
         // If block on top
         if (topBlocking(world, position)) {