Duplicated content item in Schedule block after overflow.

Steps to reproduce:
1. Create a new Landing Page.
2. Add two Schedule blocks, Hero and List.
3. Set overflow from Hero to List.
4. Add content items to first Schedule block (Hero) in following sequence: A, B, C and then B, A.
Issue: Second Schedule block displays one content item twice (A, B, C, B).

Remarks: Please see attached.