Horse hasn't been assigned a Jockey

In the Trenches (https://www.finalfurlong.org/viewhorse.php?horse=35832) races today in Race 34, but when I look at the post list his jockey slot is blank. When I checked his race instructions he does have a blank slot in No. 3 choice of Jockey, but shouldn’t that just mean a random draw rather than no jock at all?

Hm, I’m not sure what happened, but re-running the pre-race script gave him a jockey.