As a heads-up for future readers:
In the current version of Ragdoll (2024.07.01), user @Hombu in the Discord discovered that the example scene needs a minor tweak in order to run.
setAttr "_:rSolverShape.sceneScale" 1;
setAttr "_:rSolverShape.gravityY" -98.2;
Namely, the Distance Constraint doesn’t seem to respect scene scale and misbehaves as a result. Without scene scale, it reproduces the above examples.
This is considered a bug and will be fixed in the upcoming version.