When choosing the custom menu file 'debian-menu.menu' from /var/lib/menu-xdg/menus/, the git versions of xfce4-panel don't show debian-menu applications. Only Help, Office and System Tools are shown with a mention 'No applications found'.
No such issue with the released version 4.10.1, the whole Debian menu is shown.
Same issue when choosing kde4-applications.menu or gnome-applications.menu.
Not all applications are shown and a mention 'no applications found' is displayed.
No such issue with the released version 4.10.1, all apps are displayed.
I fixed this issue for my own use by patching the xfce4-panel-4.11 source,
by the ~/applicationsmenu of xfce4-panel-4.10.1 source.
No compilation errors.
All apps from the debian, gnome and kde menus are shown.
Closing bugs as xfce4-menu-plugin is deprecated/unmaintained/merged into Panel since years.