Hi. I have a very simple environment with a sphere agent. I want to do several things that I am thinking are not possible. Can someone please confirm or deny this? 1. I want to switch between RayPerceptionsSensor and Camera observations between different training runs. - I am assuming this won't work because Ray Cast and Camera, once placed on the agent, are automatically added to the observations state vector. I suppose I could write a fancy script to swap the two, but may be too complicated for me at the moment. 2. I want to have an agent sometimes have no observations, but still require decision. - I am assuming this is throwing an error because the PPO/SAC algorithms need some vector as input. Perhaps I can feed a zero or random vector, but this doesn't feel as good as a true null observation.