Didn’t get an exit stamp in your passport?
This just happened to me and I didn’t see anyone addressing it so I figured I would.
I went through the digital immigration line at BKK and because of that I didn’t get an exit stamp.
I spoke with an immigration officer and they confirmed it’s all good.
I know it seems obvious but today is my 90th day in the country so I didn’t do a 90 day report and since I plan to enter and exit by motorbike at land borders in the future I just wanted to double check.