When searching for "Skype" I always see these 2 entries. There is this duplicate blank Skype icon. Both of them seem to run Skype in the same way.
But I've checked both
~/.local/share/applications, and can't find the extra icon so I can delete it.
Also as described here, sometimes similar ghost icons are present even after removing associated applications.
apt policy skypeforlinux | grep Installedand
snap list | grep -i skype?