In case this info helps anyone, I got my second covid extension (originally arrived visa exempt) in Phuket Town and it went smoothly with no questions asked, and nothing about TM30. They're very efficient in Phuket and I haven't heard anyone being questioned, even people here since last March. Always get 100 baht change back from the fee too.
I know an IO and last night asked her about what's going on at CW. She's not aware of any changes in requirements for these extensions but she said individual managers can set their own rules. It doesn't surprise me this would happen in Bangkok. When IOs finish their training they can request to go to different areas. In a country like Thailand, the most ambitious would want to go to Bangkok. Maybe someone in Bangkok thinks being a harda55 will help their future career.