PADES-LTV document timestamp confirmation error

Question

I am signing a PDF document in the PADES-LTV signature format with the signature of the document's timestamp.

Usually signed files are fine. Signature and signature of the document tag are confirmed, and everything is in order. However, sometimes the following result occurs:

When I try to open a signed document using the Adobe reader version 10.1.0.534, the signature is verified, however the signature of the document’s timestamp cannot be verified. It says: at least one signature requires verification on the top panel. When I look at the Signatures section on the left, it says: The Subscriber ID is invalid because it has expired or is not yet valid. . If I try to open the signature details of the timestamp of the document, the Adobe reader crashes. (I sent an error report for this problem, but have not received a response yet)

When I open a signed document using Adobe Acrobat X pro and view the details of the signing of the document’s timestamp, this value of " 1970/01/01 03:00:00 + 03'00 ' " is displayed in the signature date field. In fact, the "Date" field should be Unavailable , since ETSI 102 778-4 V1.1.2 states: in the document's timestamp dictionary, name, M, Location, Reason and contact information should not be present.

Why does the adobe reader show this value 1970/01/01 03:00:00 + 03'00 ' instead of Not Available ?

What could be wrong?

thanks