Yeah, I've noticed that the infinite loop detection doesn't seem to be kicking in afaik... but, maybe that's how the systems I have are set up.
If you're worried, a good practice for the debugging stage that i use to help prevent an infinite loop from bogging down my computer is to add in a "next frame event" set to "finished" in every state that just uses a finished to click over to the next one. It doesn't stop the infinite loop from occouring but it does give your comp some breathing room so that it's easier to stop the preview when it occours.