פרק ט פסוק ו says that the ten sons were killed but in פסוק י״ג it says that Esther asked for those same ones (see רש״י) to be hanged. And the Gemara מגילה טז says the reason we read the ten sons in one breath is because they all died in one shot, which I thought meant that they got hanged all in one shot but the passuk says clearly that they were killed before they got hanged.
P.s. I have an answer but I’m looking for more...