@ferdyslab thank you for your PR! I've merged it. New builds should be available later today.

ferdyslab Oh, I sincerely appreciate your contribution! Mario, the maintainer of spine-godot, is currently on medical leave and will not be able to return until sometime next week, so it may take some time to confirm. He will check and merge when he gets back, so please wait until then.

ferdyslab Thank you for reporting this issue along with the reproduction project. I was able to reproduce the crash using the steps you described, so I created an issue ticket here to fix it: EsotericSoftware/spine-runtimes2753

There was a bug in PhysicsConstraint.cpp, which didn't apply gravity properly in some cases. This is now fixed in the 4.2 branch.

Currently building new Godot binaries. You can download them from the spine-godot docs page once this build has succeeded:
EsotericSoftware/spine-runtimesactions/runs/9076616221

ferdyslab Thank you for emailing us your repro project! We were able to reproduce the problem and have created an issue ticket for a fix here: EsotericSoftware/spine-runtimes2524
You can subscribe to this issue ticket to receive notifications when there is any progress on this issue.

Sorry about that! We've fixed the forum losing uploaded files.

ferdyslab Sorry, there seems to be an error in the upload process and I am unable to download the files you attached.
I have also tried to reproduce the problem using the steps you describe, but have been unable to do so. The bone with Gravity:100 in the physics constraint moved down as expected.

Therefore, could you please email us the reproduction project so that we can see the actual problem? : contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.