Another guess: it seems you try to copy a symbolic link which contains a relative path. So the relative path wont be correct in new location.
Maybe you can try copying the original desktop file (Careful! I guessed the paths considering posts #4 & #5):
cp /var/lib/flatpak/app/com.google.ChromeDev/current/active/export/share/applications/com.google.ChromeDev.desktop ~/Desktop
[Edit]
Or you try to copy the original desktop file from the location with full path using graphical tools.