This happened to my wife last year, when we reached the immigration desk my wife showed her British passport but they asked for her expired Thai passport and stamped it and told her to renew her passport during her stay, which she did in Bangkok and it took 72 hours.
It took a good 20 minutes of waiting at the immigration desk while they checked their records as it had been over 3 years since she was last in Thailand but there were no issues.
The official stated that a Thai citizen must enter and leave Thailand on a Thai passport only.







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