Fix armor not being visible on 1.21.20

core/src/main/java/org/geysermc/geyser/entity/type/LivingEntity.java

@@ -74,6 +74,7 @@ public class LivingEntity extends Entity {
     protected ItemData chestplate = ItemData.AIR;
     protected ItemData leggings = ItemData.AIR;
     protected ItemData boots = ItemData.AIR;
+    protected ItemData body = ItemData.AIR;
     protected ItemData hand = ItemData.AIR;
     protected ItemData offhand = ItemData.AIR;
 
@@ -112,6 +113,10 @@ public class LivingEntity extends Entity {
         this.chestplate = ItemTranslator.translateToBedrock(session, stack);
     }
 
+    public void setBody(ItemStack stack) {
+        this.body = ItemTranslator.translateToBedrock(session, stack);
+    }
+
     public void setLeggings(ItemStack stack) {
         this.leggings = ItemTranslator.translateToBedrock(session, stack);
     }
@@ -323,6 +328,7 @@ public class LivingEntity extends Entity {
         armorEquipmentPacket.setChestplate(chestplate);
         armorEquipmentPacket.setLeggings(leggings);
         armorEquipmentPacket.setBoots(boots);
+        armorEquipmentPacket.setBody(body);
 
         session.sendUpstreamPacket(armorEquipmentPacket);
     }

core/src/main/java/org/geysermc/geyser/translator/protocol/java/entity/JavaSetEquipmentTranslator.java

@@ -29,6 +29,7 @@ import org.geysermc.geyser.entity.type.Entity;
 import org.geysermc.geyser.entity.type.LivingEntity;
 import org.geysermc.geyser.entity.type.player.PlayerEntity;
 import org.geysermc.geyser.item.Items;
+import org.geysermc.geyser.network.GameProtocol;
 import org.geysermc.geyser.session.GeyserSession;
 import org.geysermc.geyser.skin.FakeHeadProvider;
 import org.geysermc.geyser.translator.protocol.PacketTranslator;
@@ -72,11 +73,19 @@ public class JavaSetEquipmentTranslator extends PacketTranslator<ClientboundSetE
                     livingEntity.setHelmet(stack);
                     armorUpdated = true;
                 }
-                case CHESTPLATE, BODY -> {
+                case CHESTPLATE -> {
-                    // BODY is sent for llamas with a carpet equipped, as of 1.20.5
                     livingEntity.setChestplate(stack);
                     armorUpdated = true;
                 }
+                case BODY -> {
+                    // BODY is sent for llamas with a carpet equipped, as of 1.20.5
+                    if (GameProtocol.isPre1_21_2(session)) {
+                        livingEntity.setChestplate(stack);
+                    } else {
+                        livingEntity.setBody(stack);
+                    }
+                    armorUpdated = true;
+                }
                 case LEGGINGS -> {
                     livingEntity.setLeggings(stack);
                     armorUpdated = true;