There are a number of exceptions to this rule. They are specified on the Belarusian border service's website, the section “COVID-19: crossing the border of the Republic of Belarus”.
According to the source, the State Border Committee of Belarus has been getting lately quite a lot of questions about leaving the country using foreign residence permits. The border service explained that only citizens with a document that confirms their right to permanent residence in another country can leave Belarus. Temporary residence permits cannot give the right to leave Belarus.
Written by: belta.by