Fix Logscale color normalization in contourf

xarray/plot/dataarray_plot.py

@@ -1581,11 +1581,16 @@ def newplotfunc(
         )
 
         if "contour" in plotfunc.__name__:
+            from matplotlib import ticker
+
             # extend is a keyword argument only for contour and contourf, but
             # passing it to the colorbar is sufficient for imshow and
             # pcolormesh
             kwargs["extend"] = cmap_params["extend"]
-            kwargs["levels"] = cmap_params["levels"]
+            if not (
+                "locator" in kwargs and isinstance(kwargs["locator"], ticker.LogLocator)
+            ):
+                kwargs["levels"] = cmap_params["levels"]
             # if colors == a single color, matplotlib draws dashed negative
             # contours. we lose this feature if we pass cmap and not colors
             if isinstance(colors, str):