Getting signed document validation errors for Signicat QTSA CC 2030 v1 timestamp certificates

[kmetsalu]

We have few signed documents by this certificate Digidoc app shows them as valid signatures but digidoc4j 5.3.0 running on Java 11 with container.validate() gives validation error.

I have few questions:

1. should we trust this certificate for timestamping?
2. if we should then how can we configure digidoc4j to accept it - we have other processes that depend on the validity check of the signature.
3. if we should'nt then what information should we give to people that have signed these documents.