Fixed an issue where the block cache became out of date and events were giving erroneous block information.

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -35,6 +35,8 @@ public class CraftWorld implements World {
         if (block == null) {
             block = new CraftBlock(this, x, y, z, world.a(x, y, z), (byte)world.b(x, y, z));
             blockCache.put(loc, block);
+        } else {
+            block.update();
         }
 
         return block;

src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java

@@ -319,5 +319,6 @@ public class CraftBlock implements Block {
     public void update() {
         type = world.getHandle().a(x, y, z);
         data = (byte)world.getHandle().b(x, y, z);
+        light = (byte)world.getHandle().j(x, y, z);
     }
 }