I just was battling the blue dire boar from the pond, got down a couple hits, collected some shields, and then the game recycled and put a regular dire boar on my board in its place with 2 of 8 hits left to ****. I finished it off, got more shields from the hits, but of course, the daily challenge was not completed.
Super frustrating.
I'm also posting this in the bugs thread if it's not there already.