Admin 1 States and Provinces 10m not being found by cfeature.NaturalEarth

[HathewayWill]

This code used to work prior to 5.1.1

feature = cfeature.NaturalEarthFeature(
      category=category,
      scale=scale,
      facecolor=facecolor,
      edgecolor=edgecolor,
      linewidth=linewidth,
      name=name,
      zorder=zorder,
      alpha=alpha,
  )
  ax.add_feature(feature)


# List of features to add
features = [("physical", "10m", cfeature.COLORS["land"], "black", 0.50, "minor_islands"),
          ("physical", "10m", "none", "black", 0.50, "coastline"),
          ("physical", "10m", cfeature.COLORS["water"], None, None, "ocean_scale_rank", 2),
          ("physical", "10m", cfeature.COLORS["water"], cfeature.COLORS["water"], None, "lakes"),
          ("physical", "10m", "none", cfeature.COLORS["water"], None, "rivers_lake_centerlines"),
          ("cultural", "10m", "none", "grey", 1.00, "admin_1_states_provinces", None, 0.70),
          ("cultural", "10m", "none", "black", 1.00, "admin_0_countries"),
          ("cultural", "10m", "none", "black", 0.60, "admin_2_counties", None, 0.50),
          ("physical", "10m", "none", cfeature.COLORS["water"], None, "rivers_north_america", None, 0.75),
          ("physical", "10m", "none", cfeature.COLORS["water"], None, "rivers_australia", None, 0.75),
          ("physical", "10m", "none", cfeature.COLORS["water"], None, "rivers_europe", None, 0.75),
          ("physical", "10m", cfeature.COLORS["water"], cfeature.COLORS["water"], None, "lakes_north_america", None, 0.75),
          ("physical", "10m", cfeature.COLORS["water"], cfeature.COLORS["water"], None, "lakes_australia", None, 0.75),
          ("physical", "10m", cfeature.COLORS["water"], cfeature.COLORS["water"], None, "lakes_europe", None, 0.75)]

But now the 10m states and provinces cannot be found by cfeature.NaturalEarthFeature. I think there is a link or something missing. Because the website can direct download it but the cfeature cannot.

It can find the 50m states and provinces though