Do it again with the other shows!Did that, and couple days later, in like the first time in never, the episode ended up having the correct "English" subtitles, along with the Spanish moved to a new "Spanish" option in the dropdown (all the eps prior only had English).
The years before, that kind of thing was never resolved (even as I go back and check some titles from some of my old support email histories between Prime, Netflix, Hulu, etc).
Also any show that has ever aired in the US on TV, already has captions available (as required by law), so there's no reason why many of the shows placed on streaming couldn't already have them included (outside of money possibly, since companies have to pay for rights to those captions)