This bug is not icon theme or artwork related, but rather related to LXpanel.
Following was tested:
*) Several different icon themes & LXpanel => same bug.
*) Several different icon themes & Xfce4-panel => no bug.
This bug is not icon theme or artwork related, but rather related to LXpanel.
Following was tested:
*) Several different icon themes & LXpanel => same bug.
*) Several different icon themes & Xfce4-panel => no bug.