A visa renewal/ extension doesn’t reset the 90 day clock . The 90 day is purely about when you arrived . It resets only after you leave and come back assuming you have the time still on your stamp .
This aspect does seem to have changed in the past 2 years or at least at Chaeng Wattana . Last 2 years -turned up after the “ under consideration “ stamp on date requested and only asked to submit passport . Waited about 30 minutes and passport returned with year stamp .