diff --git a/common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsItemRewriter.java b/common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsItemRewriter.java
index f74f2637..35b4a34e 100644
--- a/common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsItemRewriter.java
+++ b/common/src/main/java/com/viaversion/viabackwards/api/rewriters/BackwardsItemRewriter.java
@@ -134,11 +134,7 @@ public class BackwardsItemRewriter<C extends ClientboundPacketType, S extends Se
                     final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
                     for (int i = 0; i < size; i++) {
                         wrapper.passthrough(Type.STRING); // Identifier
-
-                        // Parent
-                        if (wrapper.passthrough(Type.BOOLEAN)) {
-                            wrapper.passthrough(Type.STRING);
-                        }
+                        wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                         // Display data
                         if (wrapper.passthrough(Type.BOOLEAN)) {
@@ -182,11 +178,7 @@ public class BackwardsItemRewriter<C extends ClientboundPacketType, S extends Se
             final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
             for (int i = 0; i < size; i++) {
                 wrapper.passthrough(Type.STRING); // Identifier
-
-                // Parent
-                if (wrapper.passthrough(Type.BOOLEAN)) {
-                    wrapper.passthrough(Type.STRING);
-                }
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                 // Display data
                 if (wrapper.passthrough(Type.BOOLEAN)) {
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13_1to1_13_2/Protocol1_13_1To1_13_2.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13_1to1_13_2/Protocol1_13_1To1_13_2.java
index bcacd385..76301247 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13_1to1_13_2/Protocol1_13_1To1_13_2.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13_1to1_13_2/Protocol1_13_1To1_13_2.java
@@ -52,10 +52,7 @@ public class Protocol1_13_1To1_13_2 extends BackwardsProtocol<ClientboundPackets
 
             for (int i = 0; i < size; i++) {
                 wrapper.passthrough(Type.STRING); // Identifier
-
-                // Parent
-                if (wrapper.passthrough(Type.BOOLEAN))
-                    wrapper.passthrough(Type.STRING);
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                 // Display data
                 if (wrapper.passthrough(Type.BOOLEAN)) {
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13to1_13_1/Protocol1_13To1_13_1.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13to1_13_1/Protocol1_13To1_13_1.java
index 54164332..c6283f32 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13to1_13_1/Protocol1_13To1_13_1.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_13to1_13_1/Protocol1_13To1_13_1.java
@@ -170,10 +170,7 @@ public class Protocol1_13To1_13_1 extends BackwardsProtocol<ClientboundPackets1_
 
             for (int i = 0; i < size; i++) {
                 wrapper.passthrough(Type.STRING); // Identifier
-
-                // Parent
-                if (wrapper.passthrough(Type.BOOLEAN))
-                    wrapper.passthrough(Type.STRING);
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                 // Display data
                 if (wrapper.passthrough(Type.BOOLEAN)) {
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/BlockItemPackets1_20.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/BlockItemPackets1_20.java
index b8962dd5..05af8d26 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/BlockItemPackets1_20.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_19_4to1_20/packets/BlockItemPackets1_20.java
@@ -100,10 +100,7 @@ public final class BlockItemPackets1_20 extends BackwardsItemRewriter<Clientboun
             int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
             for (int i = 0; i < size; i++) {
                 wrapper.passthrough(Type.STRING); // Identifier
-
-                // Parent
-                if (wrapper.passthrough(Type.BOOLEAN))
-                    wrapper.passthrough(Type.STRING);
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                 // Display data
                 if (wrapper.passthrough(Type.BOOLEAN)) {
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_2to1_20_3/Protocol1_20_2To1_20_3.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_2to1_20_3/Protocol1_20_2To1_20_3.java
index 1dafc9da..7fcd1eb7 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_2to1_20_3/Protocol1_20_2To1_20_3.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_2to1_20_3/Protocol1_20_2To1_20_3.java
@@ -142,11 +142,7 @@ public final class Protocol1_20_2To1_20_3 extends BackwardsProtocol<ClientboundP
             final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
             for (int i = 0; i < size; i++) {
                 wrapper.passthrough(Type.STRING); // Identifier
-
-                // Parent
-                if (wrapper.passthrough(Type.BOOLEAN)) {
-                    wrapper.passthrough(Type.STRING);
-                }
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                 // Display data
                 if (wrapper.passthrough(Type.BOOLEAN)) {
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_3to1_20_5/rewriter/BlockItemPacketRewriter1_20_5.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_3to1_20_5/rewriter/BlockItemPacketRewriter1_20_5.java
index a28c6851..85e989c7 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_3to1_20_5/rewriter/BlockItemPacketRewriter1_20_5.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20_3to1_20_5/rewriter/BlockItemPacketRewriter1_20_5.java
@@ -122,22 +122,20 @@ public final class BlockItemPacketRewriter1_20_5 extends BackwardsStructuredItem
             wrapper.passthrough(Type.VAR_INT); // Container id
             final int size = wrapper.passthrough(Type.VAR_INT);
             for (int i = 0; i < size; i++) {
-                final Item input = handleItemToClient(wrapper.read(Types1_20_5.ITEM));
+                final Item input = handleItemToClient(wrapper.read(Types1_20_5.ITEM_COST));
                 wrapper.write(Type.ITEM1_20_2, input);
-                final Item output = handleItemToClient(wrapper.read(Types1_20_5.ITEM));
-                wrapper.write(Type.ITEM1_20_2, output);
-                final Item secondItem = handleItemToClient(wrapper.read(Types1_20_5.ITEM));
-                wrapper.write(Type.ITEM1_20_2, secondItem);
+                final Item result = handleItemToClient(wrapper.read(Types1_20_5.ITEM));
+                wrapper.write(Type.ITEM1_20_2, result);
+                final Item secondInput = handleItemToClient(wrapper.read(Types1_20_5.OPTIONAL_ITEM_COST));
+                wrapper.write(Type.ITEM1_20_2, secondInput);
 
-                wrapper.passthrough(Type.BOOLEAN); // Trade disabled
-                wrapper.passthrough(Type.INT); // Number of tools uses
+                wrapper.passthrough(Type.BOOLEAN); // Out of stock
+                wrapper.passthrough(Type.INT); // Number of trade uses
                 wrapper.passthrough(Type.INT); // Maximum number of trade uses
                 wrapper.passthrough(Type.INT); // XP
                 wrapper.passthrough(Type.INT); // Special price
                 wrapper.passthrough(Type.FLOAT); // Price multiplier
                 wrapper.passthrough(Type.INT); // Demand
-
-                wrapper.read(Type.BOOLEAN); // Ignore tags
             }
         });
 
diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java
index 2124d949..69149bfc 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_20to1_20_2/rewriter/BlockItemPacketRewriter1_20_2.java
@@ -171,11 +171,7 @@ public final class BlockItemPacketRewriter1_20_2 extends BackwardsItemRewriter<C
             final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
             for (int i = 0; i < size; i++) {
                 wrapper.passthrough(Type.STRING); // Identifier
-
-                // Parent
-                if (wrapper.passthrough(Type.BOOLEAN)) {
-                    wrapper.passthrough(Type.STRING);
-                }
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
 
                 // Display data
                 if (wrapper.passthrough(Type.BOOLEAN)) {
diff --git a/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/BlockItemPacketRewriter1_99.java b/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/BlockItemPacketRewriter1_99.java
index c20d833b..1c96ac5c 100644
--- a/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/BlockItemPacketRewriter1_99.java
+++ b/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/BlockItemPacketRewriter1_99.java
@@ -54,7 +54,7 @@ public final class BlockItemPacketRewriter1_99 extends BackwardsStructuredItemRe
         registerAdvancements1_20_3(ClientboundPackets1_20_5.ADVANCEMENTS);
         registerEntityEquipmentArray(ClientboundPackets1_20_5.ENTITY_EQUIPMENT);
         registerClickWindow1_17_1(ServerboundPackets1_20_5.CLICK_WINDOW);
-        registerTradeList1_20_5(ClientboundPackets1_20_5.TRADE_LIST);
+        registerTradeList1_20_5(ClientboundPackets1_20_5.TRADE_LIST, Types1_20_5.ITEM_COST, Types1_20_5.ITEM_COST, Types1_20_5.OPTIONAL_ITEM_COST, Types1_20_5.OPTIONAL_ITEM_COST);
         registerCreativeInvAction(ServerboundPackets1_20_5.CREATIVE_INVENTORY_ACTION);
         registerWindowPropertyEnchantmentHandler(ClientboundPackets1_20_5.WINDOW_PROPERTY);
         registerSpawnParticle1_20_5(ClientboundPackets1_20_5.SPAWN_PARTICLE, Types1_20_5.PARTICLE, Types1_20_5.PARTICLE);
diff --git a/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/EntityPacketRewriter1_99.java b/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/EntityPacketRewriter1_99.java
index 87211206..10f1b53f 100644
--- a/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/EntityPacketRewriter1_99.java
+++ b/template/src/main/java/com/viaversion/viabackwards/template/protocol/rewriter/EntityPacketRewriter1_99.java
@@ -44,6 +44,7 @@ public final class EntityPacketRewriter1_99 extends EntityRewriter<ClientboundPa
         registerMetadataRewriter(ClientboundPackets1_20_5.ENTITY_METADATA, /*Types1_OLD.METADATA_LIST, */Types1_20_5.METADATA_LIST); // Specify old and new metadata list if changed
         registerRemoveEntities(ClientboundPackets1_20_5.REMOVE_ENTITIES);
 
+        // TODO Item and sound id changes in registries, probably others as well
         protocol.registerClientbound(State.CONFIGURATION, ClientboundConfigurationPackets1_20_5.REGISTRY_DATA, new PacketHandlers() {
             @Override
             protected void register() {