Any assembly definitions referencing Unity.Physics.Authoring assembly by name must be updated to instead reference Unity.Physics.Hybrid.
Changes
Renamed Unity.Physics.Authoring assembly to Unity.Physics.Hybrid. (All of its types still exist in the Unity.Physics.Authoring namespace.)
Radius of cylinder PhysicsShape is no longer non-uniformly scaled when converted.
Fixes
Fixed exception when converting a box PhysicsShape with negative scale.
Fixed incorrect orientation when fitting capsule, cylinder, or plane PhysicsShape to render mesh.
Fixed convex radius being too large when switching PhysicsShape from plane to box or cylinder.
Fixed calculation of minimum half-angle between faces in convex hulls.
Fixed collision/trigger event iterators skipping some events when iterating.
Fixed memory leak when enabling "Draw colliders" in the Physics Debug Display.
Known Issues
Physics systems are tied to (variable) rendering frame rate when using automatic world bootstrapping. See FixedTimestep examples in ECS Samples project for currently available approaches.
IL2CPP player targets have not yet been fully validated.
Some tests might occasionally fail due to JobTempAlloc memory leak warnings.
Swapping PhysicsShape component between different shape types may produce non-intuitive results when nested in hierarchies with non-uniform scale.
Some PhysicsShape configurations do not bake properly when nested in hierarchies with non-uniform scale.
PhysicsShape does not yet visualize convex hull shapes at edit-time.
Drag values on classic Rigidbody components are not currently converted correctly.