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I looked briefly, but no. I haven't found a single cocoon, as it they never existed. And there were SIX on that one small plant I can now see.

I read a post on another platform yesterday and they said wasps were killing off their monarch caterpillars. Several people chimed in and said it had happened at their place. made me think of your disappearing caterpillars..

We only had the 2 chrysalis this time...

Oh bummer! I didn't see any wasps though. I had LOTS of butterflies of many types before I saw the caterpillars though, more than ever.