Omg I wonder if that just changes the rival to Jack for just the one scene, or somehow changes rival Jill fully into Jack?? I've kinda wanted that hahah, I've thought about what if I'd picked Jack instead - would be cool as a cheat function or something, afaik it's not really possible. But yeah I assume that's more of a one-off buggy scene, and that option should only be available as an option for rival Jack playthroughs but didn't catch that.
Uh, as a fellow crew slut, I suppose I should watch out for that, maybe disable the option until fixed or I might be stuck and lose save progress if the scene happens to come up while on the ship and I get stuck on Feet-on-hog day lol.