Cannot disable overflow in schedule block

Steps to reproduce:
1. Create new landing page.
2. Add schedule block.
3. Add second schedule block.
4. Set overflow in second schedule block to the first schedule block. (Submit changes).
5. Turn off overflow in second schedule block (Submit).
6. Add content to second schedule block.
7. Add another content to second schedule block.

Actual: Content is overflown into first schedule block.
Expected: Overflow is disabled.

Second issue (reported by maciej.kobus@ez.no): Overflow is not reset when block is removed.
Steps to reproduce:
1. Create landing page.
2. Add schedule block
3. Add second schedule block.
4. Set overflow in first schedule block to the second schedule block.
5. Remove the second schedule block.

Actual: The overflow in first schedule block remains
Expected: The overflow in first schedule block is reset