Update: it seems like next week the situation could change again, hopefuly back to normality, with the only restriction (stamp refused) to people with 30 days visa exempt + 30 days extension + 7 DAYS EXTRA EXTENSION.
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Important Communication about Border Run in SATUN:
Every citizens re-entering Thailand crossing this border will be refused to get 30 days visa exempt stamp.
People with a legal one-year visa (Non Immigrant) who needs 90-days stamp, can regularly get it.
But, if your one year visa is expired, your tourist visa is expired, your 30 days visa exempt is expired, and you already got the 30 days extension at Samui Immigration, NOW YOU CAN NOT GET A 30-DAYS VISA EXEMPT STAMP AT SATUN BORDER.