It was observed that despite being created during generation jobs xAOD::JetContainer objects for Truth jets were not being written out to the EVNT file. After some debugging a number of issues were identified and are fixed in this merge request.
Update syntax for adding Truth xAOD::JetContainer objects to StreamEVGEN.
Block loading dictionaries which are not present in AthGeneration or AthSimulation during xAOD::JetContainer writing.