In my experience at Chiangmai immigration they have never asked me to prove funds for under consideration, but things may have changed . Play is safe and don't touch it until you get your extension stamp.
I am glad you had the same experience as me. I am fed up of people on here saying you have to give money. They are stupid if they do. If there paperwork is right, you don't have to pay unless you are stupid enough to fall for it.