Yes, I think the only report of it was by RoninTech, made here. I was hoping some others doing international to domestic transfers would have reported about whether this is always the case or not, and what the time-frame is, but to my knowledge, nobody has yet. So you may be right that it was just a one-off thing.

I'm not quite sure how well going through regular immigration and re-checking in would work, because if your luggage is checked through to your final destination, but you clear customs in BKK, then you won't have the CIQ or whatever sticker they give you. I could see that it could potentially cause problems in that regard. I doubt many passengers would be willing to go through regular immigration and chance having their luggage left in limbo at their final destination. But if you or anyone else has tried doing this, then please post your experiences.

The only time I tried it, I didn't have any checked luggage, so it was obviously not a problem.