I was having issues with my game, with freezing. I had already moved my sim to a new copy of Moonlight Falls, and it started happening again, not long after I started this discussion, less than three sim weeks into the current saves. There was one thing that had changed with my game just before the problems started. I had downloaded and installed the items necessary for a homeworld university. So tonight I removed all of those items. Not only did the freezing stop, but so did another issue directly related to this discussion.
I had read a few days ago that after 11 PM, only fireflies would show up with the collection helper, as all the other insects would disappear. This was not happening. But after I removed all the homeworld university items, I saw the daytime insects suddenly disappear from my sim's yard at 11 PM, and I found in map view that they were now all gone from the rest of the world too. That definitely made it easier to find the fireflies!
I don't know how the NRaas Career mod or the University rabbithole rugs could be connected to any of this, but everything in my game was functioning normally before I installed them, and everything is back to normal functioning after removing them. I'm disappointed, because I really wanted to have a homeworld university.
@SimKeats Sims have to be witches to transmute things, right? My sim isn't a witch. She's just learning alchemy, along with all the other skills. At first I thought you were referring to the science experiments. My sim has changed insects to plasma bugs with radiation experiments. She's also changed herbs to bottled super herbs, a food item to an empanada, and normal seeds to forbidden fruit seeds. That's what came to mind at first, when I read your post. LOL!
@Karritz I didn't realize there were fireflies in France. I did send my sim to Bridgeport, mostly for the fish that aren't found anywhere else. But while she was there, I had her visit the butterfly emporium at night to catch fireflies. Unfortunately, the only ones that showed up were the same two kinds she had already caught lots of at home. I know I've had sims that lived there catch more kinds than that, but they lived there, so they were there more than the two nights my sim went.