Made a simple scene to test RigidBody2D physics. Dropping a "ball in a sink" kind of setup.
-StaticBody2D (The Sink)
-RigidBody2D (The Ball)
The RigidBody2D has a physics material with a bounce value of .6 and I drew a random shape for the StaticBody2D's CollisionPolygon2D so the "ball" would have something to land on.
When the RigidBody2D bounces it eventually settles down into a point, but then it sits there and jitters (very rapid, minor movements. Shaking, shivering). It never enters the sleeping state or comes to a fully resting position. What am I missing?