Certificate parsing error

I am trying to fetch ssl certificate via get_certificate method and observing error:

irb(main):099:0> cert_client.get_certificate("ocid1.certificate.oc1.eu-blah-blah")
/usr/local/bundle/gems/oci-2.18.0/lib/oci/internal/util.rb:59:in `convert_to_type': uninitialized constant OCI::CertificatesManagement::Models::VersionStage (NameError)
                                                                             
            type = OCI.const_get(type.to_s)                                  
                      ^^^^^^^^^^                                             
Did you mean?  OCI::CertificatesManagement::Models::VERSION_STAGE_FAILED     
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate_version_summary.rb:238:in `block (2 levels) in build_from_hash'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate_version_summary.rb:238:in `map'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate_version_summary.rb:238:in `block in build_from_hash'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate_version_summary.rb:231:in `each_pair'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate_version_summary.rb:231:in `build_from_hash'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/internal/util.rb:68:in `block in convert_to_type'
        from <internal:kernel>:90:in `tap'                                   
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/internal/util.rb:67:in `convert_to_type'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate.rb:462:in `block in build_from_hash'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate.rb:450:in `each_pair'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/certificates_management/models/certificate.rb:450:in `build_from_hash'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/internal/util.rb:68:in `block in convert_to_type'
        from <internal:kernel>:90:in `tap'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/internal/util.rb:67:in `convert_to_type'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/api_client.rb:572:in `deserialize'
        from /usr/local/bundle/gems/oci-2.18.0/lib/oci/api_client.rb:462:in `handle_success_response'
        ... 14 levels...

The same error occurs on every api call, which is expected to parse certificate response, i.e. certificate creation and update.

Start by reproducing get_certificate and reading oci/certificates_management/models/certificate_version_summary.rb, then follow the response parsing into certificate.rb. Check how VersionStage is resolved and compare the affected certificate creation and update responses. Done means certificate responses deserialize without the reported NameError across these API calls.