Search not returning expected tracks

[wolfgang_bures]

I am working on some features for me app and one is to play all liked songs from an artist (see other post). While coding I came across the following "thing":

I search for songs of "dikanda", with querytype=track and query "q=artist:dikanda" and find 83 tracks. If I check those ID's against my library I find 0 matches. One ID of a song in my library is "spotify:track:35GC1aYHoKI65mZCCJ0Mdu".
This ID is NOT in the list of returned data!!! Why?

If I query the track, tha arists IS "Dikanda"
What is going on here?