Came in yesterday myself on SIMILAR O visa 12 months multi entry, and was the immigration hall busy, luckily my Thai wife was with me so used the Thai check-in , the foreigner check in was trailing well outside the main hall , so I asked my wife to deal with the IO , who had the usual blank face, and her told her to remind the IO that my 90 day was
*****
, still I checked & double checked the date before leaving the desk.... but rather painless 🙏🏼