Neeko can't copy DJ Sona properly

My friend was playing Neeko and I was playing Sona. I had the DJ Sona skin equipped, and she tried changing into DJ Sona, but there was a big and noticable issue with that. The character had no hair. And that makes it easy to guess for the enemy that it's a Neeko and not a Sona. I mean, I'm glad that I have a skin that Neeko players can't just get for free, but at the same time playing DJ Sona while having Neeko in the team is a serious nerf for Neeko. I though I should report it, because it seems like a bug. Maybe I'm wrong and Neeko purposefully can't copy Ultimate skins, haven't tried it with other skins. Edit: Here's a screenshot:
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