To answer a few questions: yes the entire itin looked fine on Saudi's website. I only found out there was a problem when I called sq to select seats. Looks fine on AC manage my booking too, as well as Aeroplan's my bookings page

I actually suspect they lost all my other seats on oz and br as well since they share the same record locator for all 3 airlines (Amadeus ?)

I didn't confirm that part since only sq had 24 hour call center, the other two were closed for the night

No additional YQ was charged, AC trans Pacific to Australia both ways would probably be 1k ballpark but I was at 500 or so originally.

CX is booked into d bucket which is a revenue fare, AC legs are in i