In reply to your question, I had the following experience just a couple days ago, but my situation is slightly different to yours by the sounds of it.

I had a retirement visa here, walked through DanNok border control. Stayed two nights and came back on third day. I actually went for a job interview, even had the invitation letter etc. But timed it to coincide with visa expiration so as to enter on a 60 day to execute the relocation of my Thai wife and I over the coming couple months. (No point buying another LTV as only here short term to move)

Thai Imm on the way out many questions why

Malay Imm - welcome welcome welcome

Malay Imm in - thank you come again

Thai Imm - immediately removed to the office - lady boss no chance to explain said go embassy get visa, managed to explain some, she changed to show me onward bound ticket. I again tried to explain we'd drive over the border. Said no, must show flight e-ticket or no entry.

Stepped outside office - 30 seconds later, man steps up - " you need stamp, give me 2k and I will do now, boss no problem, where you from, ok I get you 60 day."

Done! Back in Thailand. Better for me to use an agent if have to do again. I saw two other foreigners pulled out. Don't know what happened to them.

Lived up in Issan for at least a couple years now, in very remote village locations and the local police and people couldn't be friendlier. Never stopped and always greeted and acknowledged politely. If they've come up to me, it's out of interest and liked to chat with me, often turning to football.