The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Plot hole: Jean Grey decides to wear her original X-Men uniform in her trial-by-combat. But how could she possibly have had the uniform with her? She wasn't wearing it when the X-Men were suddenly and unexpectedly abducted by the Shi'ar and taken into outer space, and the Shi'ar weren't about to let Jean go back home and grab it. (00:07:10)
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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