Update cf/data/data.py in light of DH feedback on #247

Co-authored-by: David Hassell <davidhassell@users.noreply.github.com>

Author: sadielbartholomew

cf/data/data.py

@@ -12149,7 +12149,7 @@ def transpose(self, axes=None, inplace=False, i=False):
 
         dx = d._get_dask()
         dx = da.transpose(dx, axes=axes)
-        d._set_dask(dx)
+        d._set_dask(dx, reset_mask_hardness=False)
 
         return d