Well YOU are right - I checked this morning about an hour and saw none - but I did finally see raccoons and deer, I'd already seen horses, cats, and dogs - I checked all the areas I thought I had seen at least the spawners and other probably places in the world - none. Saw all the small creatures - rodents, lizards, snakes, a turtle and several birds. I also thought the gems were way less than normal as I only saw two during the first session. Then tonight I went back in added a new sim - hoping maybe it might trigger something - played all night with this sims until 4 am this morning and I saw one group of 3 white looking butterflies at the nectary and two monarch butterflies at the campground. No other kind - what's more I had my sim catch one and both places and kept checking back - it took nearly a Sim two weeks for the ones at the campground to spawn again - and never saw the ones at the nectary spawn again. Unless some other sim is catching them - but I don't recall ever seeing sims I wasn't playing capturing bugs or butterflies - I have seen them go after the collectible animals and I have seen cats sometimes look like they were trying to catch butterflies, but I didn't see any of this.
One other observation I also found odd - you should check and see if it does the same thing to you too, but while I was in Edit town I put a copy of your A frame in my library so I could place it on the next door lot as I was too lazy to build a clift lot and was noticing my houses were pretty filled - just two left that I could see, so I figured I'd fill some of the empty lots and add a couple ranches too - but just after I placed the clone of your A frame onto the lot next door, all of a sudden all the roads in that area (not the whole map, just that whole island practically)just vanished. There are dirt roads in that area as well as paved - the paved ones vanished. So i went back to game to see if i could see anything live, but when I did go back live, the roads replaced the missing parts. It was downright weird.
Later on I went back to edit town it did it again, but I placed a ranch anyway across from the Equestrian Center. As soon as I placed the ranch the road came back again. After that I was not able to make it do that. Even removing the ranch didn't do it. Nothing I tried would make the road vanish again. It obviously caused no problems though that I can see anyway. I am just baffled why it did that to start with.
But besides the lack of butterflies - that is the only other oddity I am seeing. I did have a paper boy complain of routing at the assylum, but I think it was because of the gate. I have seen that from paper boys in other towns every since we've had that LN gate. They complain then they vanish - so I don't think they can walk through it or something.