Your initial post was right. The Late Pick-4 was refunded. This is from the track's website:

"All win, place and show, exacta, trifecta, superfecta, Super High 5 and Daily Double wagers made involving the 12th race will be refunded, as will wagers made on the late Pick 4."

https://www.tampabaydowns.com/payout-refund-information-available-for-saturdays-last-3-races/

I did not mean by my earlier post to endorse the track's decision, just to speculate on why it might have been made. As I have posted here elsewhere, I think lot of people in horse racing are not particularly good at their jobs. On the other hand, they are working with outdated infrastructure and, in this instance, certainly had no incentive to refund bets rather than pay All-All, since the refund cost the track its share of the takeout.