On Android phone. The artist is 24-7 Spyz. Remotes show it correctly, e.g. the same phone:
In ARC it’s an underscore:
Edit: Actually that is true for many but not all artists with a hyphen. Artist list from my ARC with a filter for “-” shows:
Getting weirder:
In the Album list, one 24-7 Spyz album uses underscore, one uses hyphen, both from the same Artist name
B-52’s have hyphen but had underscore in artist list:
Ignore the question mark at Alt-J please, I thought there was an issue with capitalization but isn’t (just a difference in album artist)
Still in B111.
This seems fixed in ARC B230 (maybe before but this is where I checked).
Edit: I realize my report was on Android but now I am on iOS, and in another thread it still seems to happen on Android? So I’m removing the Solution checkmark for now, although it does not occur on iOS for me at least. 
It’s still there on Android
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