wrong search result

I have a .desktop file with this content

[Desktop Entry]
Encoding=UTF-8
Name=BUGREPORT 2022-08-31 xfce4-appfinder version 4.16.1-1
Type=Link
URL=https://hereURL.tld
Icon=system-search
Comment=LE1700, Du1900

and performed a search with app-finder. This file is found incorrectly when searching for "LE19". This file is NOT found when searching for "Du17". If I replace the comment line with this one

Comment=Du1900, LE1700

then the .desktop file is incorrectly found when searching for "Du17". This modified file is NOT found when searching for "Le19".

I believe that this is a bug in the search algorithm.