Hello.
So the Astral Meteor biome, right? After starting up a new calamity world using the most recent update to play with a friend, we beat WoF and got our astral meteor to spawn, that's all well and good. For some reason, we were able to mine it (the wiki for Calamity says we shouldn't have been able to, but I'm pretty sure we just mined it with our Reaver Sharks, although it did take a little bit). Not only that, but no enemies spawned for our entirety in the biome, and we sat there and mined the entire meteor upon finding it for at least 10 minutes. We're at the point where we should be fighting Astrum Deus, but WoF is being rude about spawning our second meteor, and assuming we even get it to spawn, I'd assume we'd have the same issue of no enemies spawning.
We're playing in a medium world if that means anything, and the meteor landed on the edge of a desert.