Schedule block preview does not work in view mode.

Steps:
1. Create a new Landing Page.
2. Add a Schedule block (hero).
3. Add a content item (blog post).
4. Change air time to the future.
5. Publish.
6. In View mode open Full list and click on the change.
Actual: Timeline slider moves but preview is not generated.
Expected: Timeline slide moves, preview is generated.

Remarks: In Edit mode preview is generated.
In the past we had a bug "the other way around" - view mode worked and edit mode didn't (EZS-642).