This might be related to Graphical interface might not start due to missing libpixbufloader-svg.so listed under Known Issues and Solutions in the 2024-11-30 Update announcement;
If that’s the case, this might help solve it;
sudo gdk-pixbuf-query-loaders --update-cache
Otherwise, if it is actually an issue with the ISO, or something else entirely, let’s see if @philm can shed any light on it.