Running the "park" argument does nothing.

Current setup: Small Grid Drone docked to a Small Grid Carrier Vehicle via 2 small connectors.

When I run the "park" argument, it appears as if the prog appears to do something (it flashes briefly), but then resumes operations as if nothing had happened.

I haven't changed the custom data for any objects, but I can use the ship to fly around and can use the "gear" and "cruise" arguments perfectly fine. So the issue seems to be with "park" specifically.

Is there an issue with "parking" a small grid to a small grid?