Sync spawned units immediately

core/src/mindustry/io/TypeIO.java

@@ -12,6 +12,7 @@ import mindustry.annotations.Annotations.*;
 import mindustry.content.TechTree.*;
 import mindustry.ctype.*;
 import mindustry.entities.*;
+import mindustry.entities.Units.*;
 import mindustry.entities.abilities.*;
 import mindustry.entities.bullet.*;
 import mindustry.entities.units.*;
@@ -278,6 +279,46 @@ public class TypeIO{
         return noAbilities;
     }
 
+    public static void writeUnitContainer(Writes write, Units.UnitContainer cont){
+        write.i(cont.unit.id);
+        write.b(cont.unit.classId() & 0xFF);
+        cont.unit.beforeWrite();
+        cont.unit.writeSync(write);
+    }
+
+    public static UnitContainer readUnitContainer(Reads read){
+        int id = read.i();
+        int typeID = read.ub();
+
+        Unit entity = Groups.unit.getByID(id);
+        boolean add = false, created = false;
+
+        if(entity == null){
+            entity = (Unit)EntityMapping.map(typeID & 0xFF).get();
+            entity.id(id);
+
+            if(!netClient.isEntityUsed(entity.id())){
+                add = true;
+            }
+            created = true;
+        }
+
+        //read the entity
+        entity.readSync(read);
+
+        if(created){
+            //snap initial starting position
+            entity.snapSync();
+        }
+
+        if(add){
+            entity.add();
+            netClient.addRemovedEntity(entity.id());
+        }
+
+        return null; //no need to actually return anything
+    }
+
     public static void writeUnit(Writes write, Unit unit){
         write.b(unit == null ? 0 : unit instanceof BlockUnitc ? 1 : 2);