Hi Grant.
I think what you described may have been a geostationary satellite.
There are a few of them known to be clustered near the position you described from your location at that time - roughly celestial coordinates 23 hours 50 minutes R.A., -5 degrees Dec., roughly corresponding to geographic coordinates 99 degrees east, 5 degrees south over Indonesia.
There is a list of geostationary satellites by real time geographic coordinates at
https://www.n2yo.com/satellites/?c=1...&dir=1&p=99999
Click on ‘longitude’, scroll down to around ’99 degrees E’ and then press the ‘track it’ button to see where the satellites are currently around that position.
I was not able to narrow it down to a specific satellite.
Regards.