Why Accounts.onCreateUser not fired when registered a new user?

After added accounts-password package, it should be ok to use Accounts.onCreateUser hook at server side to customize create user logic. But this hook never triggered when use Accounts.createUser at both client side or server side. I can see that new user created but without onCreateUser logic applied. Even I add some console.log in onCreateUser, nothing print out on server console.

Am I missing something at here, any more package we need to make onCreateUser hook works?