Use correct tag name for 1.21->1.21.2 item name fix (ViaVersion#4214)

Author: FlorianMichael

common/src/main/java/com/viaversion/viaversion/protocols/v1_21to1_21_2/rewriter/BlockItemPacketRewriter1_21_2.java

@@ -429,7 +429,7 @@ public Item handleItemToClient(final UserConnection connection, final Item item)
                 name.put("extra", new ListTag<>(Collections.singletonList(itemName)));
 
                 data.set(StructuredDataKey.CUSTOM_NAME, name);
-                saveTag(createCustomTag(item), new ByteTag(true), nbtTagName("custom_name"));
+                saveTag(createCustomTag(item), new ByteTag(true), "remove_custom_name");
             }
         }
         return item;
@@ -446,7 +446,7 @@ public Item handleItemToServer(final UserConnection connection, final Item item)
 
         final StructuredDataContainer dataContainer = item.dataContainer();
         final CompoundTag customData = dataContainer.get(StructuredDataKey.CUSTOM_DATA);
-        if (customData != null && customData.remove(nbtTagName("custom_name")) != null) {
+        if (customData != null && customData.remove(nbtTagName("remove_custom_name")) != null) {
             dataContainer.remove(StructuredDataKey.CUSTOM_NAME);
             if (customData.isEmpty()) {
                 dataContainer.remove(StructuredDataKey.CUSTOM_DATA);