fix part of pandas-dev#14052

do not bypass _interleave() if single block but of type DatetimeTZBlock or CategoricalBlock

Author: sdementen

pandas/core/internals.py

@@ -3424,7 +3424,8 @@ def as_matrix(self, items=None):
         else:
             mgr = self
 
-        if self._is_single_block or not self.is_mixed_type:
+        if ((self._is_single_block or not self.is_mixed_type)
+            and not isinstance(mgr.blocks[0], (DatetimeTZBlock, CategoricalBlock))):
             return mgr.blocks[0].get_values()
         else:
             return mgr._interleave()