@Jude7 "You have until Jun 30, 2020 to choose and redeem your Superhost bonus."
That is indeed strange- it reads like you can choose between the voucher and the photography until June 30, but then if you waited until then to choose, how could it also expire the same day you chose it?
Do please let us know if you get an answer- it sounds like some tech glitch.
But you also wrote " Each time I've maintained a year's status as a Superhost, the award was for a year ending with the start of the next quarter. In other words, for the quarter starting April 1, the award should be good until June 30, 2021, as the next quarter will start on July 1."
That doesn't make sense, either. If you are issued a Superrhost voucher on April 1, 2020, and it's good for a year, it should expire on March 31, 2021, not June 30.