How to reproduce:
1. Open the attached project "case_1249251-Project.zip"
2. Extract the "SpritePostProcess.cs.zip" located in the Assets folder (to import the Asset PostProcessor)
3. Select the "Circle1" Asset
4. In the Inspector, increase the Extrude Edges parameter by 1
5. Click the "Apply" button
6. Select the "Circle4" Asset
7. In the Inspector, increase the Extrude Edges parameter by 4
8. Click the "Apply" button
9. Add the different sliced Sprites to the Scene
10. Observe the added Sprites

Expected result: Sprite pixel density is the same when using the same Pixels Per Unit parameter
Actual result: Sprites have different pixel density when using the same Pixel Per Unit parameter

Reproducible with: 2018.4.26f1, 2019.4.9f1, 2020.1.4f1, 2020.2.0a21

Note: Sprite slices are misaligned in the Sprite Editor but correct slices are done in the Scene View after Asset PostProcessing