I tried to follow that, including double materials, and do not see any loose data appearing:
though it doesn’t look like the latest version of the panel? in case you had it installed before, could you try removing addon first, then installing again?
After that if the issue remains, could you try to replace ‘image.py’ in ’%Appdata%\blender foundation\blender\3.6\scripts\addons\pribambase` with this version and check system console again, after that replication happens.