It has been communicated to the JQ pilot group in a video with Airbus representatives and JQ flight ops management late last year that the JQ A321neoLRs are only being configured with one additional fuel tank and its range will be enough to fly Sydney Bali with winter jet streams and around 90 mins fuel over destination. Hence a useable range of around 2,500nm.
This won’t be enough range to allow the LR to replace the 787-8 on most SE Asian routes.
The 4000nm range quoted by airbus is with 3 additional centre tanks and a light cabin configuration.
Don’t forget those 232 pax on the JQ A321neoLRs have to put their bags somewhere and for every additional centre tank that is put in the aircraft a ULD position is taken away.