The office, at the stadium you went to was due originally to be at the border near Ban Kruat, which has never been opened as planned 5 years ago. I know the pleasant "maskless" officer quite well, even in the midst of Covid waves he was reluctant to wear one. So to come back to your question, there is another Immigration office, somewhat larger and quite nice too, about 4 km down the road, and, in the fullness of time, the stadium one might move to its final destination at the border.