Happened to me at Don Muang coming back from a Phnom Penh holiday just before Covid early 2020. Got pulled over and sat next to an IO desk being asked questions for 30 minutes. I was worried I would not be allowed in even though I had a 6 month METV. The IO said I should get a more "appropriate" visa for my "longer" stays. Then Covid hit and I was out of Thailand for more than 2 years so I expect everything reset.