To reproduce:
1. Open attached project
2. Play testscene
3. Observe that the number of draw calls increases from 1 to 3 when the sprite is on. Note also that there is no intermediate layer of sprites present which should be able to break batching, because there are only 2 layers of sprites in total.

The expected result in this case is that the number of draw calls should increase from 1 to 2 when the extra sprite is on.

Reproducible: 5.4.0a5 (6b220773f9c9), 5.3.0p1 (1e2decc4fa01), 5.2.4f1 (98095704e6fe), 5.0.4f1 (1d75c08f1c9c)