fix column_arrays for array manager

Author: Dr-Irv

pandas/core/internals/array_manager.py

@@ -794,7 +794,14 @@ def column_arrays(self) -> list[ArrayLike]:
         """
         Used in the JSON C code to access column arrays.
         """
-        return self.arrays
+
+        def convert_array(arr: ArrayLike) -> ArrayLike:
+            if isinstance(arr, ExtensionArray):
+                return arr.to_numpy()
+            else:
+                return arr
+
+        return [convert_array(arr) for arr in self.arrays]
 
     def iset(
         self, loc: int | slice | np.ndarray, value: ArrayLike, inplace: bool = False