Thanks skimthetrees , that's super helpful! Yes, looking within the first few days of AS's booking window, and that's where I see the largest mismatch on availability.

You're right that the availability will show on the calendar, but if you try to move forward ("continue"), the flight still won't populate. In practice, should agents still be able to see that on the phone? I asked one agent and got a simple "our award shop looks just like yours for JAL"