I see you're using a stick from outside. I do that, too. I always worry about tiny spiders, etc., that may be in crevices of the stick that aren't visible. I rinse the sticks under waters and scrub them before putting them in the cage. I have tons of tiny red spiders here and figure they'd munch on a caterpillar.
In any event, it sure looks like something was snacking on your chrysalis.