I left Vietnam after 5 days to go to Japan …no problems although could have left sooner….just make sure you take photos of all passport pages before….even blank ones
There is a tiny chance you get called in for interview
I hated staying in Vietnam personally there’s way too much pollution there. Also, it’s much better if you go to different country instead of returning to Thailand.
I guess There’s a higher chance of some sort of rejection if you come into Thailand before the DTV is approved probably although many people are saying that managed to do a border bounce fine