I don’t use jgmenu all of the time so this appears to have been broken probably since the this one was installed on May 10th.
Troubleshooting, I removed all of my csv files and there was no menu rendering at all. (just the space under my mouse cursor shown in the screenshot.
I even uninstalled and then compiled via the github version and got the same thing.
Finally, downgrading back to the previous version worked
[glaw@plex ~]$ sudo pacman -U /var/cache/pacman/pkg/jgmenu-4.1.0-1-x86_64.pkg.tar.zst
For the moment I have backlisted it in pacman
IgnorePkg = jgmenu
Just really a FYI in case anyone else runs into this.