And In-story: I figure the IFCC somehow managed to get left in the dark on that one. If Nale didn’t mention anything to Sabine for whatever reason, the IFCC wouldn’t necessarily find out that Zz’dtri was still in the game, even if he was in the penalty box for a while.
Alternatively, they Xed Zz’dtri out after he got taken away, then found out he was back, but never bothered to erase the X.