Comment 4 for bug 1555324

Same here on 17.10, right now my Netbeans icon is being used for Chromium and the Telegram icon is being used for Gnome-terminal

$ uname -a
Linux 4.13.0-21-generic #24-Ubuntu SMP Mon Dec 18 17:29:16 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
$ lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 17.10
Release: 17.10
Codename: artful

/usr/lib/mate-applets/mate-dock-applet/dock_applet.py
MATE Doc Applet
V0.79 (GTK3)