How do I warp my player character back to where he started in a level?

[Sauermann]

Looks like my code is not applicable.
I believe, the posts here describe your use-case and possible solutions:

set_position() being ignored on a RigidBody2D node

Reply From: eons Rigid bodies are not meant to be moved manually but by the physics engine, the node position will be reset by the engine to the correct values according the data of the body physics state. If you need to “teleport” a rigid body (which should be an exception), you can modify the transform’s origin of the body state. The callback _integrate_forces gives you easy access to the state and can be used for that kind of operations (you can get the st…