Do I need to refile a TM30 after getting a new passport in Bangkok?

you don't need to refile a TM30 when you get a new passport 😕 Who told you that?

When you move the stamps they note in the new passport the old number and the TM30 receipt you have will be fine with the old number.

You DO need to go and get the extension stamps moved from old passport to the new one at the office where you get your extensions.

BUT to answer your question

Counter B <- the TM30 counter & Counter A <- the 90 day report counter BOTH move back to Chaengwattana at the main office tomorrow the 18th