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Bone rotation breaks after transition

VoidChronos

As soon as the transition between jump and idle begins one SPECIFIC bone rotation breaks for all other states.
We've tried a lot but do not understand what's wrong and how to fix that.

We've tried using Hard mix, it doesn't solve the issue.
If we use Auto-Reset - the issue is hidden, but the bone is still broken, it looks weird during animations and snaps into place during idle

Unity 2020.1.2f1
Spine-runtime: spine-unity-3.8-2020-06-08.unitypackage

We've created a demo-project.
To reproduce the issue, click the jump trigger in the SpineMecanim animator.
Link to google drive with the project:

There's also link to the spine project:

Harald

Thanks for posting the reproduction package and sorry for the troubles. We will have a look at it and will get back to you as soon as we've figured out what's going wrong.

The problem and solution are the same as described in this thread:
SkeletonMecanim MixModes confusion

I have added a section to the spine-unity documentation here as well:
spine-unity Runtime Documentation: Required Additional Keys