Exactly. A few years ago I had to have a 30 day visa exempt stamp transferred to my new passport. If the DTV is digital, I guess there s nothing to transfer. Odd that they require you to physically carry the old passport. When they swipe the new one all of the old info is there.
While they are likely to deny the DTV if you are currently in Thailand, you can certainly have and enter with 2 visas. I never canceled my original visa and have entered Thailand 3 times on my new DTV. It always takes an extra couple of minutes at Immigration, but isn't a problem.
That's the endless, unanswerable question. And really has nothing to do with this thread. Fortunately, prior TM30'sare not required to enter the country.