To apply the physics feature in Unity with Spine animations, ensure that you are using the correct version of the spine-unity runtime that supports physics. As of now, the spine-unity runtime does not fully support physics, but it is expected to be available soon. You might be encountering issues because the physics feature is not yet implemented in the spine-unity runtime for version 4.2. Additionally, make sure that your Unity project settings, such as the color space, are correctly configured, although this typically should not affect physics simulation directly. If the problem persists, consider checking for any updates or patches that might address this issue.

Hi Nate and the entire Esoteric Software team!
I worked in version 3.8 for a very long time, since the project was implemented specifically for this version of the API. Now switched to 4.1. A lot of new and interesting things have appeared, but here are some points that I would like to see in the next updates of the program:

1) Hot key and method of screen selection of all child bones.
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2) Advanced bone splitting feature. Fibonacci is not always a convenient option for splitting bones, since the last bone turns out to be quite short. I suggest adding a slider for the length of the split.
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3) In Edit Mesh hold alt key to switch modify mode

Thank you for your attention!

And another one