Inelastic scatting antineutrons and protons

No conservation of four-momentum for particles produced after inelastic scattering of antineutrons and protons!!! But energy is conserved.
Is there a bug in the code or is the physical model wrong?

Geant4 Version: 4.9.3


this is correct for some physics lists. In newer versions of Geant4 there are more models, which conserve 4-momentum.


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