Have a friend who arrived 5 weeks ago and when chatting to me about doing his 90 day report online, he realised he hadn't done a TM30. He comes on OA's and had arrived on a new one. I said he might be lucky but Maneerat would charge 500 and would be ok. He went to Jomtien on Monday with all his papers. Took a while but eventually when done without any mention of a fine, the IO asked why he was doing it again as it was already done.
So, who knows. He was on a new visa, but returning to his own condo.