Geant4 Particle History May not be Working Properly/Documentation for Generated Geant4 Codes
Quote from the private chat: "There is a minimum energy set as a command line argument to the ddsim/npsim program that limits the saved mc truth. It is probably set very high so only the thrown particles are saved. You could lower this energy and the mC truth should be saved down to particles of that energy in the tracking region."
A documentation is also requested for the related generated codes.
PS: This might be better count as an issue in other sub-project instead of physics_benchmarks, but I only have the access to post an issue here.