Xfce Random icons broken

Hi !
I have a problem since few weeks on XFCE4 : for no real reason, several icons were randomly broken, showing a black rectlange with a red no parking sign. It appears for instance on battery icon, GTK Demo, and any icon inside Gimp is broken, making it unusable.
I use the elementary Xfce icons, tried with downloaded packs (ie. Redmond97), and icons are still broken (on elementary Xfce HiDPI, the broken icon is updated accordingly, resulting on a greyish rectangle with the no parking sign). Tried also the command
gtk-update-icon-cache -f /usr/local/share/icons/hicolor/ with no result.
Another theme results on the same broken icons.
Any idea ? Thanks !
 
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