--- a/net/minecraft/server/LootTableRegistry.java
+++ b/net/minecraft/server/LootTableRegistry.java
@@ -15,6 +15,7 @@
     private static final Logger LOGGER = LogManager.getLogger();
     private static final Gson b = LootSerialization.c().create();
     private Map<MinecraftKey, LootTable> c = ImmutableMap.of();
+    public Map<LootTable, MinecraftKey> lootTableToKey = ImmutableMap.of(); // CraftBukkit
     private final LootPredicateManager d;
 
     public LootTableRegistry(LootPredicateManager lootpredicatemanager) {
@@ -50,7 +51,7 @@
         LootPredicateManager lootpredicatemanager = this.d;
 
         this.d.getClass();
-        Function function = lootpredicatemanager::a;
+        Function<MinecraftKey, LootItemCondition> function = lootpredicatemanager::a; // CraftBukkit - decompile error
 
         immutablemap.getClass();
         LootCollector lootcollector = new LootCollector(lootcontextparameterset, function, immutablemap::get);
@@ -62,6 +63,11 @@
             LootTableRegistry.LOGGER.warn("Found validation problem in " + s + ": " + s1);
         });
         this.c = immutablemap;
+        // CraftBukkit start - build a reversed registry map
+        ImmutableMap.Builder<LootTable, MinecraftKey> lootTableToKeyBuilder = ImmutableMap.builder();
+        this.c.forEach((lootTable, key) -> lootTableToKeyBuilder.put(key, lootTable)); // PAIL rename keyToLootTable
+        this.lootTableToKey = lootTableToKeyBuilder.build();
+        // CraftBukkit end
     }
 
     public static void a(LootCollector lootcollector, MinecraftKey minecraftkey, LootTable loottable) {