Fixed #1601

core/src/mindustry/world/blocks/distribution/OverflowGate.java

@@ -9,6 +9,8 @@ import mindustry.world.meta.BlockGroup;
 
 import java.io.*;
 
+import static mindustry.Vars.world;
+
 public class OverflowGate extends Block{
     public float speed = 1f;
     public boolean invert = false;
@@ -125,19 +127,24 @@ public class OverflowGate extends Block{
 
         @Override
         public byte version(){
-            return 2;
+            return 3;
         }
 
         @Override
         public void write(DataOutput stream) throws IOException{
             super.write(stream);
+            stream.writeInt(lastInput == null ? Pos.invalid : lastInput.pos());
         }
 
         @Override
         public void read(DataInput stream, byte revision) throws IOException{
             super.read(stream, revision);
+
             if(revision == 1){
                 new DirectionalItemBuffer(25, 50f).read(stream);
+            }else if(revision == 3){
+                lastInput = world.tile(stream.readInt());
+                lastItem = items.first();
             }
         }
     }