Xfce (Setting->Background) bug has been introduced some time ago, for some reason, but now there's a fix in the source. I wonder when will the fix get incorporated into pkg upgrade in FreeBSD?
gitlab.xfce.org
Fix folder string being "(null)" in error popup in desktop settings (!212) · Merge requests · Xfce / xfdesktop · GitLab
When the desktop settings fails to enumerate over the folder with wallpapers for whatever reason (such as