Insect/leg unit step sound

core/src/mindustry/io/SaveVersion.java

@@ -460,6 +460,8 @@ public abstract class SaveVersion extends SaveFileReader{
     }
 
     public void readWorldEntities(DataInput stream, Prov[] mapping) throws IOException{
+        IntSet used = new IntSet();
+        Seq<Entityc> reassign = new Seq<>();
 
         int amount = stream.readInt();
         for(int j = 0; j < amount; j++){
@@ -476,10 +478,20 @@ public abstract class SaveVersion extends SaveFileReader{
                 EntityGroup.checkNextId(id);
                 entity.id(id);
                 entity.read(in);
-                entity.add();
+                if(used.add(id)){
+                    entity.add();
+                }else{
+                    Log.warn("Duplicate entity ID in save: @ (@)", id, entity);
+                    reassign.add(entity);
+                }
             });
         }
 
+        for(var ent : reassign){
+            ent.id(EntityGroup.nextId());
+            ent.add();
+        }
+
         Groups.all.each(Entityc::afterReadAll);
     }