Switching site language makes previously created nodes unusable

Switching the site language after nodes have been created make those nodes unusable.

Steps to reproduce :

1 - Install Drupal 8 RC1 in english
2 - Create a node
3 - Configure default site language as french, remove english
4 - Edit previously created node :
- Fields are empty in the form
- If I edit a field (such as body), it won't display anything on node view (only the title)
- I go back to editing my node : my body field is still empty