For demonstration I have made a simple patch:
For snapshot 0 I have put the pass button (switch)off (unlit), for snapshot 1 I have put the pass button on (yellow lit).
When I change from snap 0 (pass button is off) to snap 1, everything ok, the button changes from off to on.
But when I recall snap 0 again from snap 1, the button just stays on. I expected it to go off again.
What's going on here?

