How to reproduce:
1. Open VM > Bug Attachments > project > '1173986-rigged-sprite-issue' project
2. Open 'Sample' scene
3. Select 'Cop-T-pose' Sprite in the Assets folder
4. Select Sprite Editor in the Inspector
5. Resize Top border and click Apply
6. Notice that 'Cop T-Pose' bind pose is re-set

Expected result: Rigged GameObject's pose is not set after the Editor restart
Actual result: Rigged GameObject's pose is set after the Editor restart

Reproducible with: 2019.3.0a9(2D Animation 2.2.0), 2019.3.0a11(2D Animation 3.0.3)
Not reproducible with:2018.4.6f1(2D Animation 2.0.0) , 2019.1.14f1 (2D Animation 2.1.0), 2019.2.1f1(2D Animation 2.2.0), 2019.3.0a8(2D Animation 2.2.0)

Note:
- Could not test: 2017.4.31f1 because 2D Animation is not compatible, 2018.3.0a1, 2019.1.0a1, 2019.2.0a1 due to errors