Fixed #10436

core/src/mindustry/world/DirectionalItemBuffer.java

@@ -54,11 +54,21 @@ public class DirectionalItemBuffer{
     }
 
     public void read(Reads read){
+        read(read, false);
+    }
+
+    public void read(Reads read, boolean legacy){
         for(int i = 0; i < 4; i++){
             indexes[i] = read.b();
             byte length = read.b();
             for(int j = 0; j < length; j++){
                 long value = read.l();
+
+                if(legacy){
+                    //read value as the old format with 1-byte items, and create a new one with the new 2-byte format
+                    value = BufferItem.get(BufferItemLegacy.item(value), BufferItemLegacy.time(value));
+                }
+
                 if(j < buffers[i].length){
                     buffers[i][j] = value;
                 }
@@ -71,4 +81,10 @@ public class DirectionalItemBuffer{
         short item;
         float time;
     }
+
+    @Struct
+    class BufferItemLegacyStruct{
+        byte item;
+        float time;
+    }
 }

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

@@ -79,6 +79,11 @@ public class Junction extends Block{
             return to != null && to.team == team;
         }
 
+        @Override
+        public byte version(){
+            return 1;
+        }
+
         @Override
         public void write(Writes write){
             super.write(write);
@@ -88,7 +93,7 @@ public class Junction extends Block{
         @Override
         public void read(Reads read, byte revision){
             super.read(read, revision);
-            buffer.read(read);
+            buffer.read(read, revision == 0);
         }
     }
 }