When Unity Chan package from Asset Store is imported to Unity 5.5 and then reimported to Unity 5.6 or later, the Unity Chan model in ActionCheck scene becomes rotated.

Steps to reproduce:
1) Open the latest attached project (OC link) in Unity 5.6 - it's a 5.5 Unity Chan project from A$.
2) Open 'ActionCheck' scene.
3) Enter play mode.

Notice how the Unity Chan model is rotated sideways. It should be standing straight instead. The rotations of 'Character1_Hips' (parent object that holds components of the model) after upgrading change as follows (approx.):
X: -0.009 —> -15.502
Y: -97.686 —> 55.667
Z: -88.62 —> -90.873

This doesn't occur if importing the project from Asset Store to Unity 5.6 directly.
I was not able to reproduce this issue on other projects.

Reproduced on:
2017.1.0a1, 5.6.0b9, 5.6.0a1

Tested on:
macOS 10.12.4
Ubuntu 16.04