[Xubuntu] No icon for open windows in the panel

Hi, Weird issue since installing Xubuntu 24.10: the launcher shows the correct icon but when xfe is launched, then the icon shown is a big plus sign. I tried to give the icon path in a custom .desktop file but no change. I tested with another application and I guess that the icon is embedded in the (xfe) binary file. Thus it may be a compatibility issue with the xfce panel that displays the application icons. I tried to change the panel size, no luck. The icon changed once to the correct one when I tried to search the usr/share/icons folders for the available versions of the icon. But no idea how it could have changed anything (I did open one or 2 versions of the icons like the svg one). Note: same issue with the snap store application. Thus, it is not a problem in the xfe code but a setting somewhere that confuses xfce. It works fine for all the other applications. Note: confirmed on the xfe forum: https://sourceforge.net/p/xfe/bugs/288/ screenshot available there too.

Edit: xfce-panel 4.19.3 with Xfce 4.18 (out of the box for Xubuntu 24.10).