unix-guy
Master of RTFM
I don't think that's a bug.If you assign a control-switch modifier to a parm and then turn it on for the current scene in the Controllers->CS per Scene it doesn't change the target to the 'on' value until you leave that scene and come back (or if you turn it off in the CS per Scene it exhibits the same behavior, will stay on the 'on' value until you switch scenes and come back).
I did notice this in the previous FM3-Edit as well, so it may not be a new bug.
The CS Per Scene controls what happens when the scene is loaded, it isn't an "active" control for the CS.