Learning experience I say.
While QF does not like us doing it on the same PNR, I sometimes after my trip to NZ have a wider time between SYDi arrival and SYDd departure to ADL, leaving more time to do the int to dom transfer. By buying separate dom QF tickets.
J class from ADL to connect in SYD to anywhere overseas, (seeing ADL does not have any QF int flights anymore), sometimes very short transfer/transit time, leaving little time to use any lounges.
In your case FM, it might have not been cheaper to get an F class from the US to SYD on the same PNR in J class to CBR, than to have it separate, but next time, if you can afford it, do the booking separately, $$$$$ I know.
1hr25mins (int to dom) means not a lot of time to stay in the SYDd QP/J lounge.
A lot of J class flights AKL/WLG/CHC to SYD/MEL to ADL on the same PNR in my case, gives me 1hr30mins coming back.
One time coming back from WLG, I had to practically run from MEL T2 to MELT1, because of storms the JC flight into MEL was very late. Same PNR. Didnt get the chance to use the MELd QP. Grrrrrrrrrrrr...
Jinxed, maybe not, bad luck, aye to that one.