Rigid bodies are not controlled like kinematics.
move_and_slide is there to give your kinematic body a collision response. However, rigid bodies, because they are controlled by the physics engine, automatically respond to collisions by rotating, bouncing, etc.
When using rigid bodies, you don't control the body directly. You apply forces (
add_force()) or impulses (
apply_impulse()) to the body and the physics engine moves it appropriately. However, you must be careful to use these correctly.
See Using RigidBody2D for an introduction on working with RigidBody2D.
If you need a more specific answer, you'll have to share more details of your implementation.