title: Unknown layer: KerasLayer when i try to load_model
body: <p>When i try to save my model as hdf5</p>
  <pre><code>path = 'path.h5'
  model.save(path)
  </code></pre>
  <p>then load the model again</p>
  <pre><code>my_reloaded_model = tf.keras.models.load_model(path)
  </code></pre>
  <p>I get the following error</p>
  <pre><code>ValueError: Unknown layer: KerasLayer
  </code></pre>
  <p>Any help ? I'm using</p>
  <pre><code>tensorflow version:  2.2.0  
  keras version:  2.3.0-tf
  </code></pre>