1. Use Ibexa Experience 4.6.2.
2. Place a block in page builder.
3. Remove the block. Observe the "Drag and drop blocks here" text.

Expected result:
There is a smooth position transition of the block fades out.
Actual result:
There is a jump at the end, see attached screenshot.
Note: Behavior is the same if there is another block left in the zone.