This is not entirely correct for EK385.
For EK384 DXB-BKK-HKG and EK385 HKG-BKK-DXB, passengers are required to stay on board during the transit
For EK418 DXB-BKK-SYD, passengers must disembark the aircraft and reboard (they need to spray the plane)
For EK419 SYD-BKK-DXB, passengers have a choice of either disembarking the aircraft or staying on board