Only apply round boundary to polar projs

proplot/axes/geo.py

@@ -859,7 +859,7 @@ def _update_boundary(self, round=None):
         Update the map boundary path.
         """
         round = _not_none(round, rc.find('geo.round', context=True))
-        if round is None:
+        if round is None or not isinstance(self.projection, self._proj_polar):
             pass
         elif round:
             self._is_round = True