Hi,
I wanted to make use of your package for soft bodies simulation and I found out that something must have changed between 2018 and 2019 Unity releases.
See attached image for meaning of "broken":
image
image

Skinned mesh triangles seems to be quite randomized.
I've tested it with current master commit and Unity Package's imported one.

2018年4月6日f1 is the last release where soft skinned mesh behaves for me correctly.
Checked on Windows only.

I could not find any related change in changelog... https://unity3d.com/unity/whats-new/2019.1.0