  Dark Energy Survey five-year supernovae data (DES 5YR SNe) in conjunction
with Planck CMB and Dark Energy Spectroscopic Instrument (DESI) BAO data has
detected a strong dynamical dark energy deviation from the $\Lambda$CDM model.
Here, we shift the focus of DES data to the pressureless matter sector in the
$\Lambda$CDM model by studying the matter density parameter $\Omega_m$.
Employing frequentist profile likelihoods, we demonstrate that $\Omega_m$
increases with effective redshift in the DES dataset at up to $2.5 \sigma$
level. At the highest redshifts, one encounters negative dark energy densities
$\Omega_m > 1$. Our findings corroborate earlier observations in Pantheon and
Pantheon+ datasets with an independent SNe dataset with a higher effective
redshift. In an appendix, we confirm that curvature $\Omega_k$ decreases with
effective redshift disfavouring a flat Universe in higher redshift DES SNe at
$> 3 \sigma$. Our choice of $\Omega_k$ prior leads to an underestimation of the
tension with a flat Universe.
