They’ve set up tons and never returned to it. I see absolutely no reason why Mal/Lily and Black Fairy would be any different. It would be more shocking to actually return to those plot lines now so far after the fact
Lets not forget the Mulan and aurora saving philip that they always say next season and so far nothing, or how there are more things to show from the past year in S3 and is always the next season, just to name some, bc there are a lot of things they say they will show and they end not showing anything.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".