Please note that we have 2 Passports. Not an old and a new one but 2 valid passports.
The officer must not cancel or destroy any of our passports.
We need both passports because of frequent traveling and because many countries in SEA still require the conventional stamped visa.
I have also one passport (with existing visa) which has no more free page. Thus my new visa has to be stamped into the second passport.
The last immigration stamp is in the first passport.
The first passport I still need for other trips and to renew the passport.