I speak French and it probably doesn’t help but it just sounds wrong when misgendered except for words that begin with a vowel syllable for some reason. Even we, struggle with those. E.g. avion, hélicoptère, école. We also use the l’ for those words instead of le/la but it becomes harder when we’re have to choose un/une. Maybe that’s a hint to what’s happening. Any language expert can chime in?