When creating content from the frontend, with legacy_mode: false using the preview button in Website toolbar will cause a redirect to versionview.

Steps to reproduce:

1. Log in to an eZ Demo based frontend, in order to create content
2. Start creating a new article (first draft)
3. Hit the preview button on the Website Toolbar (don't publish it yet)

You will be redirected to versionview, and we will not be able to continue editing.
Also, the Website Toolbar will not be displayed.