Layer items are drawn to incorrect place in timeline

When copying and pasting existing layer, the items in the timeline are drawn to incorrect place.

Steps:

1. Create a layer with items

2. Copy and paste the layer to scene to create second layer.

3. Expand/unexpand the first layer

Result: When expanded, the items inside first layer are drawn after the second layer.

When saving and reopening the presentation in the studio the items are drawn in correct place.