Reaching a search page through direct URL leads to spinning wheel in form

The search form page is ill-functioning when reached through a direct URL

How to reproduce:

1. Create a new Page provider named simple with query filter = "ecm:isTrashed = 0 AND ecm:isVersion = 0 AND ecm:mixinType != 'HiddenInNavigation'" and one predicate = "ecm:fulltext FULLTEXT (system_fulltext)"
2. Create default layouts and slot (drawer item) contributions
3. Deploy the project
4. Open the search results page by navigating to:
   http://localhost:8080/nuxeo/ui/#!/search/simple
5. Open the simple search form using the drawer icon
6. See the disabled search form with a continual spinning/loading icon overlay, however you can still click the search/clear buttons.

Reaching the same page through normal navigation is OK

Expected behavior: entering the search through direct URL leads to a functional form.