Of course there is no requirement, but it reasonable that this is an expectation, purely based on past QF policy. I guess the OP knows differently now, but the fact QF used to do the use would create that expectation, remembering of course not everyone is an airline nerd who would keep abreast of the continous enhancements and LCC-isation of QF.

I guess if you have spa treatments and Neil Perry inspired menus that's what makes a premium airline, not doing little things like help your customers in situations like this. I do genuinely wonder if the seamless transfer bus will go the same way, ie require same ticket, or a connection to OW or QF, not from.