Fails to find an artist by name

[gcampax]

Log:

====
# main/a951fd6b-aefc-4d91-a716-baa760a8f432
#! timestamp: 2021-08-03T19:12:20.089Z
U: what's the latest by charlie xcx
UT: $dialogue @org.thingpedia.dialogue.transaction.execute;
UT: sort(release_date desc of @org.thingpedia.media-source.playable() filter contains(artists, null^^org.thingpedia.media-source:artist("charlie xcx")))[1];
#! timestamp: 2021-08-03T19:12:21.812Z
A: Did you mean get the music by charlie xcx with the maximum release date?
A: Sorry, I cannot find any Music artists matching “charlie xcx”.

[nrser]

Name is "Charli Xcx"