Darryl, the REX a/c that flew this service is transmitting an incorrect hexcode.
This rogue hexcode is 7C8076 which is should be allocated to VH-ZNS. Unfortunately rego VH-ZNS doesn't exist.
The only hope is that a Mk. 1 eyeball can spot the return flight RXA329 due in at 12:55 and advise the a/c's rego.
BTW, I'm YSSY6 on FlightRadar24