PDFBox version 3.0.0-RC1
pdftoppm version 21.04.0
mupdf-gl version 1.18.0
This might be an unusual issue but might needs to be checked. The simple code below creates a PDF that can't be viewed with Poppler because of "error: malformed page tree"
This is not a content issue because all PDFs from the same producer have the same problem, I've just picked an example.