If it happens, then ( although may not help getting acces that time ) the reasonable compensation provided by Qantas customer relations can make up for it
I raised it when I had an issue with an EK lounge - I contacted QF customer relations afterwards and spoke to somone reasonably senior, who after checking in to it ,confirmed that whether I had the QF number or another in the booking makes no difference to the entitlement to lounge access and that the agent should have provided the benefits
I have had no real issues with QF lounges using QFF benefits when crediting elsewhere