I’ve seen mixed reports on Survanbhumi Airport re-entry permit process. Today I can confirm that it’s exactly like it was before. You need to enter through gate / zone 2, where you can see a sign saying re-entry permit counter.
Then go through security like normal, and proceed to the re-entry permit desk before going through passport control.
I think this will save stress so you don’t accidentally go through a different zone where there’s no re-entry counter. Meaning you would have to go through passport control first.
The process was smooth and simple for me today, with absolutely no people in the cue. The airport was fairly busy though despite it being low season.