PaperMC/paper-server/nms-patches/net/minecraft/world/level/block/BlockMobSpawner.patch

--- a/net/minecraft/world/level/block/BlockMobSpawner.java
+++ b/net/minecraft/world/level/block/BlockMobSpawner.java
@@ -33,9 +33,16 @@
     @Override
     public void spawnAfterBreak(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, ItemStack itemstack) {
         super.spawnAfterBreak(iblockdata, worldserver, blockposition, itemstack);
+        // CraftBukkit start - Delegate to getExpDrop
+    }
+
+    @Override
+    public int getExpDrop(IBlockData iblockdata, WorldServer worldserver, BlockPosition blockposition, ItemStack itemstack) {
         int i = 15 + worldserver.random.nextInt(15) + worldserver.random.nextInt(15);
 
-        this.popExperience(worldserver, blockposition, i);
+        // this.popExperience(worldserver, blockposition, i);
+        return i;
+        // CraftBukkit end
     }
 
     @Override