diff --git a/patches/net/minecraft/client/multiplayer/ClientPacketListener.java.patch b/patches/net/minecraft/client/multiplayer/ClientPacketListener.java.patch
index ba17981ad6..c244326521 100644
--- a/patches/net/minecraft/client/multiplayer/ClientPacketListener.java.patch
+++ b/patches/net/minecraft/client/multiplayer/ClientPacketListener.java.patch
@@ -8,14 +8,16 @@
      @Nullable
      private LevelLoadStatusManager levelLoadStatusManager;
      private boolean serverEnforcesSecureChat;
-@@ -366,6 +_,7 @@
+@@ -366,7 +_,8 @@
              p_253924_.gui.getChat().restoreState(p_295121_.chatState());
          }
  
+-        this.potionBrewing = PotionBrewing.bootstrap(this.enabledFeatures);
 +        this.connectionType = p_295121_.connectionType();
-         this.potionBrewing = PotionBrewing.bootstrap(this.enabledFeatures);
++        this.potionBrewing = PotionBrewing.bootstrap(this.enabledFeatures, this.registryAccess);
      }
  
+     public ClientSuggestionProvider getSuggestionsProvider() {
 @@ -427,12 +_,13 @@
  
          this.minecraft.debugRenderer.clear();
diff --git a/patches/net/minecraft/server/MinecraftServer.java.patch b/patches/net/minecraft/server/MinecraftServer.java.patch
index 5d60f55f4d..cebd24b556 100644
--- a/patches/net/minecraft/server/MinecraftServer.java.patch
+++ b/patches/net/minecraft/server/MinecraftServer.java.patch
@@ -9,6 +9,15 @@
          thread.setUncaughtExceptionHandler((p_177909_, p_177910_) -> LOGGER.error("Uncaught exception in server thread", p_177910_));
          if (Runtime.getRuntime().availableProcessors() > 4) {
              thread.setPriority(8);
+@@ -315,7 +_,7 @@
+             this.structureTemplateManager = new StructureTemplateManager(p_236726_.resourceManager(), p_236724_, p_236728_, holdergetter);
+             this.serverThread = p_236723_;
+             this.executor = Util.backgroundExecutor();
+-            this.potionBrewing = PotionBrewing.bootstrap(this.worldData.enabledFeatures());
++            this.potionBrewing = PotionBrewing.bootstrap(this.worldData.enabledFeatures(), this.registryAccess());
+         }
+     }
+ 
 @@ -372,6 +_,7 @@
          this.readScoreboard(dimensiondatastorage);
          this.commandStorage = new CommandStorage(dimensiondatastorage);
diff --git a/patches/net/minecraft/world/item/alchemy/PotionBrewing.java.patch b/patches/net/minecraft/world/item/alchemy/PotionBrewing.java.patch
index 9c3be6f23f..7612a5fff4 100644
--- a/patches/net/minecraft/world/item/alchemy/PotionBrewing.java.patch
+++ b/patches/net/minecraft/world/item/alchemy/PotionBrewing.java.patch
@@ -56,11 +56,22 @@
              Optional<Holder<Potion>> optional = p_43531_.getOrDefault(DataComponents.POTION_CONTENTS, PotionContents.EMPTY).potion();
              if (optional.isEmpty()) {
                  return p_43531_;
-@@ -127,6 +_,7 @@
+@@ -124,9 +_,18 @@
+         }
+     }
+ 
++    /**
++     * @deprecated Use {@link #bootstrap(FeatureFlagSet, net.minecraft.core.RegistryAccess)} instead
++     */
++    @Deprecated
      public static PotionBrewing bootstrap(FeatureFlagSet p_341301_) {
++        return bootstrap(p_341301_, net.minecraft.core.RegistryAccess.EMPTY);
++    }
++
++    public static PotionBrewing bootstrap(FeatureFlagSet p_341301_, net.minecraft.core.RegistryAccess registryAccess) {
          PotionBrewing.Builder potionbrewing$builder = new PotionBrewing.Builder(p_341301_);
          addVanillaMixes(potionbrewing$builder);
-+        net.neoforged.neoforge.common.NeoForge.EVENT_BUS.post(new net.neoforged.neoforge.event.brewing.RegisterBrewingRecipesEvent(potionbrewing$builder));
++        net.neoforged.neoforge.common.NeoForge.EVENT_BUS.post(new net.neoforged.neoforge.event.brewing.RegisterBrewingRecipesEvent(potionbrewing$builder, registryAccess));
          return potionbrewing$builder.build();
      }
  
diff --git a/src/main/java/net/neoforged/neoforge/common/VillagerTradingManager.java b/src/main/java/net/neoforged/neoforge/common/VillagerTradingManager.java
index 92a0a16b4e..b36bbdb53b 100644
--- a/src/main/java/net/neoforged/neoforge/common/VillagerTradingManager.java
+++ b/src/main/java/net/neoforged/neoforge/common/VillagerTradingManager.java
@@ -12,6 +12,7 @@
 import java.util.List;
 import java.util.Map;
 import net.minecraft.core.NonNullList;
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.world.entity.npc.VillagerProfession;
 import net.minecraft.world.entity.npc.VillagerTrades;
@@ -35,20 +36,20 @@ public class VillagerTradingManager {
 
     static void loadTrades(TagsUpdatedEvent e) {
         if (e.getUpdateCause() == TagsUpdatedEvent.UpdateCause.SERVER_DATA_LOAD) {
-            postWandererEvent();
-            postVillagerEvents();
+            postWandererEvent(e.getRegistryAccess());
+            postVillagerEvents(e.getRegistryAccess());
         }
     }
 
     /**
      * Posts the WandererTradesEvent.
      */
-    private static void postWandererEvent() {
+    private static void postWandererEvent(RegistryAccess registryAccess) {
         List<ItemListing> generic = NonNullList.create();
         List<ItemListing> rare = NonNullList.create();
         Arrays.stream(WANDERER_TRADES.get(1)).forEach(generic::add);
         Arrays.stream(WANDERER_TRADES.get(2)).forEach(rare::add);
-        NeoForge.EVENT_BUS.post(new WandererTradesEvent(generic, rare));
+        NeoForge.EVENT_BUS.post(new WandererTradesEvent(generic, rare, registryAccess));
         VillagerTrades.WANDERING_TRADER_TRADES.put(1, generic.toArray(new ItemListing[0]));
         VillagerTrades.WANDERING_TRADER_TRADES.put(2, rare.toArray(new ItemListing[0]));
     }
@@ -56,7 +57,7 @@ private static void postWandererEvent() {
     /**
      * Posts a VillagerTradesEvent for each registered profession.
      */
-    private static void postVillagerEvents() {
+    private static void postVillagerEvents(RegistryAccess registryAccess) {
         for (VillagerProfession prof : BuiltInRegistries.VILLAGER_PROFESSION) {
             Int2ObjectMap<ItemListing[]> trades = VANILLA_TRADES.getOrDefault(prof, new Int2ObjectOpenHashMap<>());
             Int2ObjectMap<List<ItemListing>> mutableTrades = new Int2ObjectOpenHashMap<>();
@@ -66,7 +67,7 @@ private static void postVillagerEvents() {
             trades.int2ObjectEntrySet().forEach(e -> {
                 Arrays.stream(e.getValue()).forEach(mutableTrades.get(e.getIntKey())::add);
             });
-            NeoForge.EVENT_BUS.post(new VillagerTradesEvent(mutableTrades, prof));
+            NeoForge.EVENT_BUS.post(new VillagerTradesEvent(mutableTrades, prof, registryAccess));
             Int2ObjectMap<ItemListing[]> newTrades = new Int2ObjectOpenHashMap<>();
             mutableTrades.int2ObjectEntrySet().forEach(e -> newTrades.put(e.getIntKey(), e.getValue().toArray(new ItemListing[0])));
             VillagerTrades.TRADES.put(prof, newTrades);
diff --git a/src/main/java/net/neoforged/neoforge/event/brewing/RegisterBrewingRecipesEvent.java b/src/main/java/net/neoforged/neoforge/event/brewing/RegisterBrewingRecipesEvent.java
index 53ff0f6af2..669e61cedd 100644
--- a/src/main/java/net/neoforged/neoforge/event/brewing/RegisterBrewingRecipesEvent.java
+++ b/src/main/java/net/neoforged/neoforge/event/brewing/RegisterBrewingRecipesEvent.java
@@ -5,6 +5,7 @@
 
 package net.neoforged.neoforge.event.brewing;
 
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.world.item.alchemy.PotionBrewing;
 import net.neoforged.bus.api.Event;
 import org.jetbrains.annotations.ApiStatus;
@@ -16,13 +17,19 @@
  */
 public class RegisterBrewingRecipesEvent extends Event {
     private final PotionBrewing.Builder builder;
+    private final RegistryAccess registryAccess;
 
     @ApiStatus.Internal
-    public RegisterBrewingRecipesEvent(PotionBrewing.Builder builder) {
+    public RegisterBrewingRecipesEvent(PotionBrewing.Builder builder, RegistryAccess registryAccess) {
         this.builder = builder;
+        this.registryAccess = registryAccess;
     }
 
     public PotionBrewing.Builder getBuilder() {
         return builder;
     }
+
+    public RegistryAccess getRegistryAccess() {
+        return registryAccess;
+    }
 }
diff --git a/src/main/java/net/neoforged/neoforge/event/village/VillagerTradesEvent.java b/src/main/java/net/neoforged/neoforge/event/village/VillagerTradesEvent.java
index 58adf8c425..4fb6c4c2fb 100644
--- a/src/main/java/net/neoforged/neoforge/event/village/VillagerTradesEvent.java
+++ b/src/main/java/net/neoforged/neoforge/event/village/VillagerTradesEvent.java
@@ -7,6 +7,7 @@
 
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import java.util.List;
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.world.entity.npc.VillagerData;
 import net.minecraft.world.entity.npc.VillagerProfession;
 import net.minecraft.world.entity.npc.VillagerTrades.ItemListing;
@@ -14,6 +15,7 @@
 import net.neoforged.neoforge.common.BasicItemListing;
 import net.neoforged.neoforge.common.NeoForge;
 import net.neoforged.neoforge.event.TagsUpdatedEvent;
+import org.jetbrains.annotations.ApiStatus;
 
 /**
  * VillagerTradesEvent is fired during reload by {@link TagsUpdatedEvent}. It is used to gather the trade lists for each profession.
@@ -28,10 +30,21 @@
 public class VillagerTradesEvent extends Event {
     protected Int2ObjectMap<List<ItemListing>> trades;
     protected VillagerProfession type;
+    private final RegistryAccess registryAccess;
 
+    /**
+     * @deprecated Use {@link #VillagerTradesEvent(Int2ObjectMap, VillagerProfession, RegistryAccess)} instead
+     */
+    @Deprecated(forRemoval = true, since = "1.21.1")
     public VillagerTradesEvent(Int2ObjectMap<List<ItemListing>> trades, VillagerProfession type) {
+        this(trades, type, RegistryAccess.EMPTY);
+    }
+
+    @ApiStatus.Internal
+    public VillagerTradesEvent(Int2ObjectMap<List<ItemListing>> trades, VillagerProfession type, RegistryAccess registryAccess) {
         this.trades = trades;
         this.type = type;
+        this.registryAccess = registryAccess;
     }
 
     public Int2ObjectMap<List<ItemListing>> getTrades() {
@@ -41,4 +54,8 @@ public Int2ObjectMap<List<ItemListing>> getTrades() {
     public VillagerProfession getType() {
         return type;
     }
+
+    public RegistryAccess getRegistryAccess() {
+        return registryAccess;
+    }
 }
diff --git a/src/main/java/net/neoforged/neoforge/event/village/WandererTradesEvent.java b/src/main/java/net/neoforged/neoforge/event/village/WandererTradesEvent.java
index 4c9880952c..ba3766f6d9 100644
--- a/src/main/java/net/neoforged/neoforge/event/village/WandererTradesEvent.java
+++ b/src/main/java/net/neoforged/neoforge/event/village/WandererTradesEvent.java
@@ -6,11 +6,13 @@
 package net.neoforged.neoforge.event.village;
 
 import java.util.List;
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.world.entity.npc.VillagerTrades.ItemListing;
 import net.neoforged.bus.api.Event;
 import net.neoforged.neoforge.common.BasicItemListing;
 import net.neoforged.neoforge.common.NeoForge;
 import net.neoforged.neoforge.event.TagsUpdatedEvent;
+import org.jetbrains.annotations.ApiStatus;
 
 /**
  * WandererTradesEvent is fired during reload by {@link TagsUpdatedEvent}. It is used to gather the trade lists for the wandering merchant.
@@ -21,10 +23,21 @@
 public class WandererTradesEvent extends Event {
     protected List<ItemListing> generic;
     protected List<ItemListing> rare;
+    private final RegistryAccess registryAccess;
 
+    /**
+     * @deprecated Use {@link #WandererTradesEvent(List, List, RegistryAccess)} instead
+     */
+    @Deprecated(forRemoval = true, since = "1.21.1")
     public WandererTradesEvent(List<ItemListing> generic, List<ItemListing> rare) {
+        this(generic, rare, RegistryAccess.EMPTY);
+    }
+
+    @ApiStatus.Internal
+    public WandererTradesEvent(List<ItemListing> generic, List<ItemListing> rare, RegistryAccess registryAccess) {
         this.generic = generic;
         this.rare = rare;
+        this.registryAccess = registryAccess;
     }
 
     public List<ItemListing> getGenericTrades() {
@@ -34,4 +47,8 @@ public List<ItemListing> getGenericTrades() {
     public List<ItemListing> getRareTrades() {
         return rare;
     }
+
+    public RegistryAccess getRegistryAccess() {
+        return registryAccess;
+    }
 }