Miguel Angelo In another group, this was asked and someone said that they were told when trying to cross at Mae Sai that they wouldn’t get their 90 days. I can’t remember if they actually crossed the border and got
*****
/whatever days or if they didn’t bother to go through with it at all.
Of course, hearsay.
Edit: Also possible he’d already met his 2 visa exemptions and that’s why it was not allowed.