I'm gonna chalk this up to a Void update, and I'm putting it here in the Airedale section, even though it's identical in my Spectr system.
It appears that iso mounting is broken (fusemount?) and I think fusemount was recently updated.
I simply get an error when trying to mount an iso either using Rox, pcmanfm, or Thunar that the iso failed to mount. An empty directory shows up in /mnt for the iso.
Wondering if anyone else noticed this, or is it particular to me? I've been updating and resquashing psuedo full installs every couple months, and that's been fabulous, except for this annoyance. I always have F96 or a previous KLV I can boot into to mount isos.