Timeline shows items from the past (in the "upcoming scheduled events" list).
Steps to reproduce:
1. Login as admin
2. Go to Page
3. Create a new Landing Page
4. Add a Code Block
5. Open block settings, "Scheduler" tab
6. Set "Reveal" to a date in the past
7. Submit block
8. Publish Landing Page
9. Preview the Landing Page in Page Builder
10. Open the timeline and display upcoming events
List is empty
An event from the past is visible.