I think I have a good handle on the new mystery target rules.
If all the mode shots are at the same point it will award you the left ramp first then right orbit if left ramp is already completed.
Lets say you are one away from starting the right ramp mode and you hit the target, it will spot that one. It will spot the mode shot that’s closest to starting a mode.
Once you’ve played two modes it stops spotting shots even if you haven’t Hit the target at all.
Not sure if this resets after total isolation or not.