The actual issue is that even when PDF has embedded only OCSP response, Acrobat Reader doesn't show it, but shows local CRL instead.
This is caused of non-conforming, to RFC6960 or RFC2560, OCSP certificate.
Wrong OCSP certificate path:
Root CA -> Operational CA -> Client certificates (certificates checked with OCSP)
Root CA -> OCSP
Right OCSP certification path:
Root CA -> Operational CA -> Client certificates (certificates checked with OCSP)
Operational CA -> OCSP