What are the current Covid rules for transit through Singapore from Bangkok to Hong Kong?

Travelers transiting through Singapore from Bangkok to Hong Kong must have a negative PCR test within 48 hours of departure if they do not plan to enter Singapore. All flight segments must be booked on the same ticket. However, if entering Singapore, a negative PCR test is still required, and travelers must be on a VTL (Vaccinated Travel Lane) flight from Bangkok. Additionally, there is a two-day window for the validity of the PCR test results, allowing for some flexibility in timing.