Recent experience (Australian)….
Entered Thailand on Multi EntryTourist Visa early May valid until 30 September.
After 1st 60 days, got 30 day extension. Then border bounced to Cambodia for a further 60 days.
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flew to Penang, returning to Dom Mueang
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Questioned by IO why I’m coming to Thailand. Stated tourist on METV. She replied I come to Thailand many times, which was very true but always on Tourist Visas. Anyway, after producing my airline return ticket to Australia to her supervisor, I got stamped in for another 60 days.
I was a bit surprised by it all, nonetheless.