@mingbo I was referring to this post
https://discourse.pollination.cloud/t/construction-library-doesnt-open-due-to-missing-material/749/7
maybe I should have put the link in the first place.
The file is loaded “correctly” somehow, but like I showed there it doesn’t make sense how it’s processed.
To make it even more clear, there is the question where does the 3rd material come from if not shown in the Materials Manager?
Support that one too.