SITL Simulation TURN_RADIUS Parameter Problems

I’m using the Rover simulation and am not seeing a change in the turn radius when I change it from 0.9 m to 10 m. After writing the parameter change, closing and restarting SITL, and refreshing the parameter list TURN_RADIUS shows up as 10 m but tracks the exact same arc that is much smaller than 10 m.

Any suggestions? I’ve seen this behavior on the stable release and the latest build.