Odd issues after installing XFCE4 on FreeBSD 14

Howdy all,

I recently installed FreeBSD 14.2 on an older laptop and immediately
upgraded it to 14.3:
% uname -Kmrsv
FreeBSD 14.3-RELEASE-p3 FreeBSD 14.3-RELEASE-p3 GENERIC amd64 1403000

Then I installed the XFCE4 DE and lightdm display manager:
pkg install lightdm \
lightdm-gtk-greeter \
tigervnc-server \
xfce \
xdm \
xfce \
xorg

Before rebooting I also enabled the /proc FS mount in /etc/fstab, and
added to /etc/rc.conf.local:
echo 'dbus_enable="YES"' >> /etc/rc.conf.local
echo 'lightdm_enable="YES"' >> /etc/rc.conf.local
Then rebooted

I get the lightdm greeter, and can log in just fine. At first glance,
everything seemed fine. Then I tried to change the desktop wallpaper:
Applications -> Settings -> Desktop
which launches fine but pops up two error message windows, one right on
top of the other, both showing:
Unable to load image from folder "(null)"
Operation was cancelled
I can close those, and make changes to the wallpaper selection, but
the changes are not applied. Interestingly they are configured in
~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-desktop.xml
but the changes are not displayed. That also generates entries in
~/.xsession-errors:
(xfdesktop-settings:95115): GVFS-RemoteVolumeMonitor-WARNING **: 18:43:03.919: remote volume monitor with dbus name org.gtk.vfs.UDisks2VolumeMonitor is not supported
(xfdesktop-settings:95115): GLib-GObject-CRITICAL **: 18:43:05.155: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
(xfdesktop-settings:95115): GLib-GIO-CRITICAL **: 18:43:05.155: g_file_get_path: assertion 'G_IS_FILE (file)' failed
(xfdesktop-settings:95115): GLib-GObject-CRITICAL **: 18:43:05.282: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
(xfdesktop-settings:95115): GLib-GIO-CRITICAL **: 18:43:05.283: g_file_get_path: assertion 'G_IS_FILE (file)' failed

And with that I am totally lost, so figured I'd kindly ask for any
assistance here.

Thanks,Pat