Can a border-run be done without actually entering another country, thus avoiding the need for a visa for e.g. Laos, Cambodia or Myanmar? Meaning: Stamping out of Thailand, but never stamping in in the neighbor country. Instead turning around in the no man's land in between and stamping directly back into Thailand? If not, is there other ways to avoid the third country visa need? I think Myanmar had some border regions that you could visit for an hour or two and then head back into Thailand - visa-free (against USD 10 in cash or so, if I remember correctly). Excuse the question. Never did a border run myself - never had to before. Planning ahead for a season on a METV - as they messed up the new LTR visa.
TLDR : Answer Summary
A user is inquiring if it is possible to perform a border run from Thailand to a neighboring country without entering that country, effectively exiting Thailand and immediately re-entering without a stamp from the third country. Several commenters confirm that this is not allowed, stating that one must be stamped into the neighboring country. They discuss various border crossing experiences, specifically at the Myanmar border, and alternatives that may have existed prior to COVID-19. The conversation reveals that while some previous border run methods may have been more lenient, current regulations typically require an entry stamp from the neighboring country, and that visa requirements can vary based on the traveler's nationality.