I just saw point 5. in the terms and conditions for reissuance... didn't see that before!
I swear this is a new thing, though they don't put the date the T&Cs were updated...
Tickets for Airline Award Travel may be re-issued:
Only for travel by the same person
Provided no part of the ticket for Airline Award Travel has been used
Subject to additional mileage credits being required if the new journey belongs to a higher award zone
USD100 or 10,000 mileage credits will be charged each time a ticket is reissued.
Subject to having the same expiry date as the original ticket and for use on the same airline