DoclingParseDocumentBackend.page_count() returns -1 when docling-parse fails to parse PDF page tree

[PeterStaar-IBM]

link to original issue: docling-project/docling#3031

[zhjuly]

I'm encountering the same issue on docling-parse v5.8.0:
Inconsistent number of pages: 11!=-1
Has this issue with DoclingParseDocumentBackend.page_count() been resolved?https://github.com/docling-project/docling/issues/3031