How to reproduce:
1. Open the attached project's Scene labeled "SampleScene"
2. Enter the Play Mode
3. Above the Game View Window, enable "Stats"
4. In the Stats Window, inspect the number of Batches

Expected result: Gameobjects with regular Sprites and Sprite Skin are added to the same Batch
Actual result: Gameobjects with regular Sprites and Sprite Skin are not Batched together

Reproducible with: 2019.3.0b3, 2019.3.14f1, 2020.1.0b9, 2020.2.0a11 (3.0.5, 3.2.2)
Not reproducible with: 2018.4.23f1, 2019.3.0b2 (1.0.15-preview.1, 3.0.4)
Couldn't test with: 2017.4.40f1 (Package Manager does not exist)