Paper/nms-patches/BlockMobSpawner.patch

--- a/net/minecraft/server/BlockMobSpawner.java
+++ b/net/minecraft/server/BlockMobSpawner.java
@@ -14,9 +14,19 @@
     @Override
     public void dropNaturally(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, ItemStack itemstack) {
         super.dropNaturally(iblockdata, worldserver, blockposition, itemstack);
+        /* CraftBukkit start - Delegate to getExpDrop
         int i = 15 + worldserver.random.nextInt(15) + worldserver.random.nextInt(15);
 
         this.dropExperience(worldserver, blockposition, i);
+        */
+    }
+
+    @Override
+    public int getExpDrop(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, ItemStack itemstack) {
+        int i = 15 + worldserver.random.nextInt(15) + worldserver.random.nextInt(15);
+
+        return i;
+        // CraftBukkit end
     }
 
     @Override