From September 2022 , this video claims the test flight was done but again no actual footage. The screenshots are from another video taken in May and the building looks close to completion but pretty abandoned.
So far, Darasakor International Airport in Koh Kong Province is 100% completed and scheduled to open in mid-2023. Darasakor International Airport is a joint venture project in Koh Kong province. The airport is 100 percent completed and still obliged to obtain the airport operation certificate.