I know! Totally surprised when I found out that Oasis has it!
It is not on the cruise planner and on the compass (it will say my time 6.45pm to 9pm) - what they do is, they set aside about 40% of the my time space and move people to it that have the same reservations around 7pm for each day at my time - you will get a sea pass with the 6.45 dining time and your table number.