If I perform a text search using:
[=isequal([artist],Beyoncé,9)]=1
I get back a single track, which is a track where I've intentionally tagged the artist as "Beyonce" (last "e" is ASCII "e"). No other "Beyoncé" tracks are found (last "é" is Latin Small Letter E with Acute).
Now if I go into the Wizard's Import / Export area, I see that MC has converted the expression into:
[=isequal([artist],Beyonce,9)]=1
This explains the single track match.
But if I paste the original search expression above into the Wizard, hit Apply (or OK), then all tracks with artist Beyoncé are returned, but not the single track mentioned above w/Artist = Beyonce. Swap the Search from Wizard to Text, and the search area shows [=isequal([artist],Beyoncé,9)]=1, but only the one track is found.
The same thing occurs when using MCWS' Files/Search. The first search expression above only returns the one track. Search seems to be trying to canonicalize or simplify to ASCII, but it is not then correctly obtaining entries with non-ASCII letters.