There is a fundamental difference between what Jetstar are doing and what airlines all over the world do in terms of so-called 'Tag Flights'.
No other flight within any airline in the world - not even QANTAS, as far as I am aware undertakes 2 stops in the SAME COUNTRY whilst picking up additional passengers at the first port of entry using the overseas crew.
The immigration law is simple and unambiguous. In Australia you are required to pass through immigration at your first port of entry, once you have passed through immigration, unless you are in possession of a visa that confers the right to work (Crew Travel Authority does not confer this right) and undertake work you are an illegal worker. (immigration define work as that which normally attracts remuneration).
Crew Travel authorities are specific in they allow crew to work on flights into and out of Australia only and NOT within!!
What is significant is that compliance with immigration law is a personal responsibility and in addition to the organisation who employs you being fined for each and every individual breach for employing a person wthout a valid work visa, it is particularly the individual who will come off the worst with a potential for substantial fines, exclusion from Australia for a minimum of 3 years and potentionally a jail sentence.
Overseas Crew working between Australian ports and on International flights originating in Australia you should be concerned about this and you should take this up with your manager as soon as possible.
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The Kelpie