On slicing the .psb from the sprite editor window, character pose changes in the skinning editor, refer attached video.

Steps to Reproduce:
1. Create a New Project with 2D Template
2. Import .psb in the project window
3. Inspector > Sprite Editor
4. Sprite Editor > Slice > Apply
5. Sprite Editor > Skinning Editor

Actual Result:
Character pose changes on slicing the .psb from Sprite Editor

Expected:
Character pose doesn't change on slicing .psb from Sprite Editor

Note: 2D animation package 3.0.2 is introduced in unity 2019.3.0a10

Reproducible on:
2020.2.0a4, 2020.1.0b3, 2019.3.6f1, 2019.3.0a10

Package Found version: 4.2.1, 4.1.0, 3.0.8, 3.0.5, 3.0.2

Environment:
Windows 10 and macOS 10.14