Just to be clear:
SIngapore was TAR VietNam>>confirmed
Bandung is TAR 23 >>confirmed.
SPEC: Have to wonder if this was a PLANNED leg or a SUBSTITUTE leg since the conditions with the HAZE in Malaysia are so bad....
I lean towards it being a substitute leg. I'm surprised they went back to Indonesia again (happily so, I like the Indonesian legs). One sign for a substitute leg would be somewhere they are familiar and comfortable with and know they can set up a leg on short notice. Obviously they have developed some good working relationships with companies in Indonesia and they are familiar with the need of the TAR production team.
One other thought: In the last few days or so, I saw an interview (probably linked to here but I can't find it), where either BVM or Phil discussed how planning for the last few seasons has changed since CBS cut their filming budget. Now, if they film a couple of legs in an expensive location like Europe, they have to balance it with a couple of legs in relatively inexpensive locations. I'm not sure where the potentially moved leg was originally going to be (Malaysia seems likely), but both Malaysia and Indonesia would appear to be relatively inexpensive locations to my uninformed eyes.