What should I expect when re-entering Thailand after receiving a Muay Thai visa?

Got approved for Muay Thai visa today, same day after the interview for 5 years. I used an agency which helped get all the documents in order before everything was submitted, IMO, this makes it worth the cost. They also have a service that can do the 90 day report for a small fee.

Short story though: about a month ago, I attempted to return to Thailand on a visa exempt status after my ED visa expired, I got grilled at the BKK border and was denied entry. I don't believe i was given a fair chance to demonstrate my Thai knowledge, the officers were quite hostile which totally threw me off and I hesitated having a conversation with them in Thai. They asked maybe 2 questions at most and spoke at a native level, didnt ask to see if I could read or write Thai - the experience afterwards was fking awful. Anyone that has been through this will know 😂... surprisingly very few first hand accounts of others experiences i can find online, but you literally get treated like a criminal.

Anyway, just curious if anyone has had an extended stay in thailand and now obtained the DTV. Will they ask to see a departure flight? Got the feeling if I fly back into BKK, they will try to give me a hard time for the most idiotic reasons even though I have a legit visa.

Please advise 🙏