Not really a design oversight so much as a boneheaded rule interpretation. I don't think anybody in decades of DnD ever rolled a single d4 for multiple magic missiles until Crawford made that ruling.Oh cool, like rolling 2d4 per missile then. Sounds sort of like a design oversight though, but a weirdly satisfying one.
Just a quick mention that the Storm Sorcery Origin, while moving from UA to publication, lost its bonus Spells Known. My guess would be that the Favored Soul will, too.
A new Favoured Soul that is no longer overpowered, far more balanced, and actually feels a lot more like a divine spell caster. I miss the wings how ever, but I love Blessed Counterance.