a few more foods for thought
- reboot the machine.
- start the epson or vuescan flatpak
- “lsmod”
- start the rpm version of vuescan
- “lsmod”
and compare the output between the 2 runs. also make sure that the vuescan rpm didnt install files that would load modules on startup
what might happen that vuescan in the rpm version might trigger loading more modules and the flatpak can not trigger it.