Poppler doesn't show digital signatures without visible component

Poppler doesn't recognize digital signatures without visible component (visible signature) It is possible to sign PDF without visible signature and poppler/Okular can't handle that properly

STEPS TO REPRODUCE

1. Open digitally signed PDF (make sure there are signatures w/o visible component) or use pdfsig on pdf files

OBSERVED RESULT

1. If there's at least one digital signature with visible component poppler will recognize it and will omit all others without visible component

EXPECTED RESULT

1. All digital signatures regardless of visible component should be recognized

ADDITIONAL INFORMATION Two attached documents:

1. Contract.pdf - 3 digital signatures, none of them with visible component
2. The Scrum Guide - 3 digital signatures, 2 with visible component

Contract_test.pdf 2017-Scrum-Guide.pdf