People going to Savannakhet for visa runs who have previously held ED or Volunteer visas and extensions.
I'm not sure how long Savannakhet have been applying this.
I've just noticed it listed on Bangkok Visa run site.
I've no idea regarding Vientiane as they no longer go there.
TLDR : Answer Summary
The discussion revolves around the options available for visa runs to Savannakhet for individuals previously holding ED (Education) or Volunteer visas in Thailand. There is uncertainty about how long these practices have been in place, but a user pointed out that Savannakhet is now mentioned on the Bangkok Visa run website, while Vientiane is no longer a destination for visa runs. Additionally, there are no reported issues from users regarding visa runs from Savannakhet, and some companies still facilitate trips to Vientiane.