Empty Schedule block preview sticks out of block border while dragging from one zone to another.

Steps:
1. Create new LP (number of zones irrelevant).
2. Add Schedule block to zone (don't add content).
3. Select the block and move it around by dragging its menu.
4. Verify the position of the (empty) block's preview.
Actual: Preview sticks out of border (recording attached).
Expected: Preview stays within border.

Remarks: Problem occurs until refreshing of preview is triggered (by e.g. adding content, timeline refresh every minute, opening settings form and submitting).