This issue is related to Landing Page snapshots (EZEE-1594).

When loading information about the Schedule Blocks from snapshot additional Overflow Events are generated, which should not be displayed.
As a result the timeline and full view might become cluttered with false information.

Steps to reproduce:
1. Create a Landing Page
2. Add 3 Schedule Blocks (S1, S2, S3)
3. Set overflows: S1 -> S2 -> S3
3. Add 3 items to S1 (in the same time), causing overflow
4. Publish
5. – pretend 3 weeks have passed – (for example by changing the server time 3 weeks ahead)
6. Go to created previously LP, edit it and publish again

Expected behaviour:
1. As the articles and the overflows happened in the past, there are not shown.

Actual behaviour:
1. As the overflows are processed when loading from LP snapshot, the Overflow events are generated once again and are visible on the timeline and in the Full list view (with current date).