Entity entity = location.getWorld().spawnEntity(location, EntityType.VILLAGER);
Villager villager = (Villager) entity;
System.out.println("Spawned Villager. Current Profession: " + villager.getProfession().name());
                
villager.setProfession(Profession.BUTCHER);
System.out.println("Modified Villager. Current Profession: " + villager.getProfession().name());
                
 final Villager villagerFinal = villager;
 getServer().getScheduler().scheduleSyncDelayedTask(instance, new Runnable() {
  @Override
  public void run() {
    try {
      System.out.println("1 Second Wait. Current Profession: " + villagerFinal.getProfession().name());
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }
}, 20);