In conclusion, we have shown that the DM21 functional's performance in transition metal chemistry, despite being comparable in accuracy to B3LYP, faces challenges in SCF convergence that makes it of little to no practical use in this domain. Despite these limitations, we also showed that evaluating DM21 functionals on B3LYP densities results in improved performance over self-consistent B3LYP for TMC117 reactions. To shed light on the SCF convergence issues of DM21 with transition metal molecules, we have analyzed the DM21 features, highlighting the distinctions between transition metal atoms/oxides and their main-group counterparts.