4.16 changes the appearance of minimized windows from putting the name in brackets to greying the text out. restore the old behavior with
xfconf-query -c xfce4-panel -t bool -s true -n -p $(xfconf-query -l -c xfce4-panel -v | grep -P "^/plugins/plugin-\d+\s+tasklist$" | awk '{print $1"/label-decorations"}')
(source: Disable brackets on minimized windows in Xfce 4.14 · GitHub)