When searching for J availability SIN-LAX for July '23 I noticed that SQ12 is not presented as an option on the day I'm looking to fly (not even shown on the page). When I search the same departure date with a stopover in NRT (on the dame day) it shows that the two SQ12 legs are available. When I select both and hit continue it moves to the next page without error. I don't have enough miles in my account. I'm just curious if this will actually be bookable or if when I have enough miles in my account and try to book if it will throw an error in the final booking stages.