It's more or less intended… the third hit of Hayate's FR teleports through the opponent and then back and the back teleport causes the spinny relaunch (you can see the combo count increase). However, Hitomi was kinda far away so it looks off since Hayate doesn't actually teleport through the opponent …and they could add a sound effect for the back teleport hit or something
Imo they are pretty generous with the hitboxes and relaunches of FRs in general… the upside is that they are easy to use as/in Juggles, the downside is that you get those wonky looking edge cases.