ALL passengers remain on board during all stops via BKK . in and outbound. No exception to leave aircraft for lounge or 24h layover or whatever.
The length of the stop is NO indication at all.. Most returning flights ex BKK leave early as crew will try to leave earlier
Catering fueling cleaning takes some time.
Returning to AMS some flights are sold to Thai passengers ( usually flight kl 876)
Safe travels to CGK mr Club europe