Hi All - Has anyone with an ED visa for Thai language ever had problems re-entering Thailand? Or have any recommendations?

I have a 1-year ED visa that began in April. Next month I intend to travel outside of Thailand for 3 weeks. This is my first time traveling outside of Thailand with ED visa. (Will have re-entry permit + letter from language school)

Have heard different stories about Immigration sometimes not allowing some on language ED visa to return. Thanks!

If I use a second passport (dual nationality, not a blank passport) that has no history of any entries to Thailand – will immigration be able to link this to my main passport?

My main passport has a lot of SETVs and VEs – if I was to switch the passport I enter with every 8-12 months, would that effectively look like I’ve been outside of Thailand for that period?

Or will the all seeing eyes of immigration know what I’m up to?