I wonder how many other times judges have given positive GOE for a triple popped into a double?
In short programs, never, unless the judges made a mistake (or unless it's a double axel instead of a triple as the solo axel jump, more likely in the men's event) because if a triple is required in the SP, the GOE is required to be -3.
I'm not saying it has never happened, but it seems odd. I would think that the base score should be the best a skater could get for a popped jump.
What do you mean by "popped"?
In long programs, skaters are allowed to do whatever jumps they want, as long as they have at least one axel, don't repeat more than they're allowed, and don't do more combinations than allowed. They're allowed to do doubles. Below the top elite levels, it's expected that some senior ladies will plan some doubles because they don't have enough different triples in their repertoire to fill seven jumping passes -- the very weakest senior ladies won't try any triples at all in their freeskates.
So even for the elite skaters, male and female, who are expected to do the six or seven or eight triples (and maybe a quad or two), they have the option of turning a planned triple into a double on purpose whenever they want during a freeskate, if they're slightly off balance or feeling fatigued or don't have enough speed or the ice doesn't feel right or they're running out of room, etc., etc. If it comes out as a good-quality double then it deserves positive GOE.
A "popped" jump in which the skater intends to do a triple but the body doesn't cooperate in the air is more likely to have an awkward air position, which would be a case against positive GOE and maybe a reason for -1. But if there are other good things about the jump compared to a just-OK intentional double (or triple) -- e.g., speed, height, distance, difficult entry, etc., then it would make sense for a judge to think "There were enough things about that jump that were better than just OK to deserve +2 GOE, but the rhythm and air position were not well controlled, so I'll reduce it to just +1."
That's why when a skater does a big popped single jump we often see GOEs ranging from -1 to +1, depending how many judges focus on the awkward air position and rhythm and how many focus on the size and speed of the jump which would usually be much more impressive than the average single jump by skaters at a level where single jumps are expected.
If it looks like a good double (or good single) and you would have to know the skater and know the planned program content to know for sure that a triple was planned there, then positive GOE is absolutely appropriate. There's no GOE reduction required for "I know that skater is capable of triples and was planning a triple here so that double was a mistake."