[2D][Sprite Atlas] After removing object from atlas, removed object is not rendered during Playmode

Repo steps:
1. Pack 2 separate sprites into an atlas
2. Add them to the scene and enter Playmode
3. Observe both are rendered
4. Stop Playmode and remove 1 sprite from packing list, click Pack Preview button
5. Observe only 1 sprite rendered in scene in Playmode
6. Add sprite back in atlas and repeat process but do not click on Pack Preview button
7. Notice both sprites are rendered in Playmode

Expected result: Removed packed object is rendered during Playmode
Actual result: Removed packed object is not rendered during Playmode

Reproduced in: 2020.1.0a17, 2019.3.0f3, 2019.2.16f1, 2019.1.14f1, 2018.4.12f1