Try to do a railing(Painels) over a stair with winders turned on. Is pathetic waste all the day looking for a workaround and see that you can't do that.
You use invisible wall to define the stair limit, so you use railing tool to make railing painels and turn on follow stair. You can't make your stair ignore the railing to define the limit of the winders.
People who made this tool probably do not use the software.
Extend Stringer Top is useless if this can't reach the ceiling.