From 899ca04160bd1a929f86d74c1d1dd6203ff332f6 Mon Sep 17 00:00:00 2001
From: Florian Reuth <git@florianreuth.de>
Date: Sun, 18 Oct 2026 20:44:53 +0200
Subject: [PATCH] Fix items atlas text components in 1.21.11->1.21.9 being
 invalid

Fixes https://github.com/ViaVersion/ViaVersion/issues/4865

Signed-off-by: Florian Reuth <git@florianreuth.de>
---
 .../rewriter/ComponentRewriter1_21_11.java           | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_11to1_21_9/rewriter/ComponentRewriter1_21_11.java b/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_11to1_21_9/rewriter/ComponentRewriter1_21_11.java
index 68ed695fa..ce0462e46 100644
--- a/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_11to1_21_9/rewriter/ComponentRewriter1_21_11.java
+++ b/common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_11to1_21_9/rewriter/ComponentRewriter1_21_11.java
@@ -18,11 +18,13 @@
 package com.viaversion.viabackwards.protocol.v1_21_11to1_21_9.rewriter;
 
 import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.StringTag;
 import com.viaversion.viabackwards.api.BackwardsProtocol;
 import com.viaversion.viabackwards.api.rewriters.text.NBTComponentRewriter;
 import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
 import com.viaversion.viaversion.protocols.v1_21_9to1_21_11.packet.ClientboundPacket1_21_11;
+import com.viaversion.viaversion.util.Key;
 
 public final class ComponentRewriter1_21_11 extends NBTComponentRewriter<ClientboundPacket1_21_11> {
 
@@ -30,6 +32,16 @@ public ComponentRewriter1_21_11(final BackwardsProtocol<ClientboundPacket1_21_11
         super(protocol);
     }
 
+    @Override
+    protected void processCompoundTag(final UserConnection connection, final CompoundTag tag) {
+        super.processCompoundTag(connection, tag);
+
+        final StringTag atlas = tag.getStringTag("atlas");
+        if (atlas != null && Key.stripMinecraftNamespace(atlas.getValue()).equals("items")) {
+            atlas.setValue("blocks");
+        }
+    }
+
     @Override
     protected void handleShowItem(final UserConnection connection, final CompoundTag itemTag, final CompoundTag componentsTag) {
         super.handleShowItem(connection, itemTag, componentsTag);