I haven't booked a OWA in years, am in the process of completing one.
Most recent change added the second OW airline, which I thought automatically changes the points table to OWA, instead of multiple point to point trips. Phone agent came back with the fare rules require it to be calculated when returning to point of origin (I'm not quite halfway to 35k miles), so no point in doing so right now.
Is this new?
I see this in the terms:
14.4.3 A one way oneworld Classic Flight Reward Itinerary will be charged as a return Itinerary. Itineraries finishing in a port other than the port of origin must include the distance to return directly to the port of origin when calculating the number of Qantas Points required to redeem the Flight Reward and the maximum distance for the Itinerary.
The last OWA I took was pre-covid, so something may have changed.