That had honestly not occurred to me since I always have a beast parked since we've gotten so many, many animals that offer the same drops. During events I always park the monster du jour while I go about gathering and whatnot. In reality, my guesses as to what S8 might do and what they actually do are usually wildly off the mark so you're probably safe from this issue.
Speaking of what S8 should do, this current event issue is such a rookie mistake that it's almost laughable. I guess it has been a while since there was an event mix up this bad in CS so statistically we were probably overdue for one. That being said... this is ridiculous and any business worth their salt would extend the current hunt for an amount of time that is equal to the time we are currently losing. I can only hope that S8 fixes this soon and does the right thing once it's back up.
This happened (sort of) on another S8 game over New Year's weekend and to my knowledge it is still being sorted. Seeing as how this is during regular business hours and they're already aware of it, it should be a relatively quick and easy fix. I'm off to stare at my game while I refresh it every 30 seconds and wait for the event to be back online. Fingers crossed!