  We explore the properties of the last generation of $\rho$(770) and
$K^*$(892) resonances created in Au+Au reactions at E$_\mathrm{lab}=1.23$~AGeV
via the reconstruction in the hadronic channel using the UrQMD model. Such
resonance studies allow to obtain detailed information on the emission source
in such reactions in a complementary way to di-lepton or HBT studies. We
observe a freeze-out hierarchy and predict mass shifts for the $\rho$(770)
resonance ($\Delta m_\rho \approx -330$ MeV) and the $K^*$(892) resonance
($\Delta m_{K^*} \approx -30$ MeV). These mass shifts are related to the
regeneration cycles of each resonance species and are of purely kinetic origin.
Experimentally our predictions can be tested using the GSI-HADES experiment or
the lowest RHIC-BES energy.
