For example, upon dissociation of H 2 , DM21 gets the region around equilibrium right (weak correlation) as well as the dissociation limit (strong correlation) as it has been trained on its dissociation limit. However, describing homonuclear diatomics at intermediate bond distances (e.g., about 3Å for H 2 ) can be even more challenging than the dissociation limit due to the delicate interplay between weak (dynamical) and strong (static) correlation. For the intermediate distances, DM21 displays a large unphysical bump in the H 2 dissociation curve. This deficiency of DM21 can be fixed by symmetry breaking or fractional KS occupations, but the two approaches would also fix e.g., B3LYP's H 2 dissociation curves. The challenge is thus to build an XC approximation capturing strong correlation in the standard KS framework without artificial symmetry breaking.