[curt.clifton]

What are your view settings? If you show Remaining actions grouped by Due Soon, then the item will show. (That is, switch to the built-in Due Soon perspective, turn on the View Bar, and change the Due Soon lozenge to Remaining.)

The way it works now is more flexible than if unavailable, but due soon, actions were displayed. For example, my Check Email action has a start time of 2.5 hours after completion and a due time of 3.5 hours after completion. That action would never be hidden under your proposal, but the reason for a future start time is precisely so it will be hidden.

If you want to see all Due Soon items, even if they aren't available, then you can save your own perspective showing that view. Just choose Perspective --> Save Window as New Perspective.