The image shows documents with bar and patch code separators. The separator pages are detected by a PD417 bar code. The bar code page is part of the actual document. Hence, the detected separator page is retained.
Document 1:
Pages 1 to 4
PDF417 bar code indicates separator page
Separator pages are retained
Document 2:
Pages 5 to 9
Some extra pages may be appended
Setting maximum number of pages to 7 allows detection of missing separator page
Document 3:
Pages 10 to 13