Fix for dummied server side registry entries while client has read entries.

src/main/java/net/minecraftforge/registries/GameData.java

@@ -544,7 +544,7 @@ public class GameData
                     // The server believes this is a dummy block identity, but we seem to have one locally. This is likely a conflict
                     // in mod setup - Mark this entry as a dummy
                     int id = reg.getID(dummy);
-                    FMLLog.log.warn("Registry {}: The ID {} is currently locally mapped - it will be replaced with a dummy for this session", key, id);
+                    FMLLog.log.warn("Registry {}: The ID {} @ {} is currently locally mapped - it will be replaced with a dummy for this session", dummy, key, id);
                     reg.markDummy(dummy, id);
                 }
             });