I've two pdf documents certified (signed and validated with the same mechanism based on Itext 7 ) and when i use adobe reader DC to check their validity, only one has the green mark.
the good one: https://1drv.ms/b/s!AkF6t4TavwMvgxWaidlUqvPvHH1r
the bad one: https://1drv.ms/b/s!AkF6t4TavwMvgxQCMdGY61S1EvUh
Regards
David L