Operating system: Windows 10
Graphics card: Nvidia GTX 1080
Broken: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e
2.81 (sub 16), branch: master, commit date: 2019-12-04 11:32, hash: f1aa4d18d49d
Worked: 2.79, d7cecc2ba3f6
Short description of error
Using a tutorial blend file for Hair rigging which utilizes cloth simulation, the cloth simulation behaves as expected in 2.79; however when that same blend file is opened in 2.8 the simulation breaks and behaves like jello/jelly when a much smoother, gentle behavior was expected/desired.
Edit: I have determined that object scale seems to play a huge role in the observed behavior of physics objects (Rigid Body, Cloth Sim, etc). In a scene at 1x scale (relative to Blender cube) most physics don't work as expected, being very unstable/bouncy/jiggly. However in a clean test scene at 8x scale, physics was much more "damped" smooth, and the parameters seem to actually have an affect when changed. Applying scale at 8x did not result in 1x behavior. Adjusting mass has no effect.
Exact steps for others to reproduce the error
Load the attached blend file in 2.79, play the animation/timeline and manipulate the "head"/root bone of the setup'd rig, particular with r+z and then rotate it along the z axis left to right and back and observes its behavior. Then, open the same blend file in 2.8 and repeat, observe that the behavior is now different.