Removing a content item from schedule block after publishing the page makes pushed-out item move back from another schedule block.

Steps:
1. Follow the flow from https://github.com/ezsystems/StudioUIBundle/blob/master/Features/DynamicLandingPage/Schedule3Block.feature
2. Publish the page.
3. Switch from View mode to Edit.
4. Remove one content item from SB2.
Actual: Item is removed from SB2 but also the pushed-out item from SB3 moves back to SB2.
Expected: Item is removed from SB2 and moved to history. SB3 content item is not affected.
(additional step)
5. Move timeline slider back one minute.
Result: Item removed from SB2 in step 4 is visible in SB3.

Remarks: Please also see the attached screen-shots.