Have they removed the seat selection page from reward flights?

The flight to Berlin I was looking at has gone up by £30 to £158 (£700+ in CE and I'm not paying that!) in the last few minutes so might as well blow 9000 Avios + £35 instead.

If I go to pay by cash, I can select a seat.
If I use Avios, I get the personal details page and then the payment page. No seat selection option anywhere during the booking process.