Spotify only filtering library by first artist?

[worldanuu]

Plan

in Premium Family

Country

United Kingdom

Device

HP Pavilion Laptop

Operating System

Windows 10

My Question or Issue

When trying to filter my library by the name of an artist, a song will only come up if the artist is the first or primary named artist. Why does this happen and how can I fix this?

(example attached - although the song is in my library, the searched artist is listed second so the song doesn't come up? this is the only reason I can think of as to why it wouldn't)