Canon EOS RP manual says that the EF - EOS R adapter should be attached to the lens first, and only then should the entire assembly be attached to the camera.
I have understood that the same is true for teleconverters as well: the teleconverter should be attached to the lens first, and after it, the assembly should be attached to the camera.
However, especially with the EF - EOS R adapter, if having lots of EF lenses, it may be more convenient to swap just the EF lens, not touching the adapter that is left semi-permanently connected to the body.
If I understand correctly, a powered-on camera may become confused if the adapter/teleconverter is on the camera and just the lens is changed.
If I turn off the camera for the duration of the lens change and keep the adapter on the camera body, changing only the lens, can there be any bad effects?