Steps to reproduce:
1. Add 2 schedule blocks (hero template): S1 and S2.
2. Set overflow from S1 to S2.
3. Add A and B items to S1.
4. Item A is pushed to S2 due to overflow.
5. Remove overflow in S1 settings.

Result: Item A is visible in S2 even though S1 and S2 are no longer linked by overflow setting
Expected result: S2 should be empty.