  Song et al. [Phys. Rev. C 102, 065208 (2020)] presented results for the
$\Lambda_c N$ interaction based on an extrapolation of lattice simulations by
the HAL QCD Collaboration at unphysical quark masses to the physical point via
covariant chiral effective field theory. We point out that their predictions
for the $^3D_1$ partial wave disagree with available lattice results. We
discuss the origin of that disagreement and present a comparison with
predictions from conventional (non-relativistic) chiral effective field theory.
