Sorry about posting for multiple bugs. And I double-checked and you're correct about the Fletcher household. I'd overlooked this and thought it was a dorm.
While the cheating thread you posted about sounds like it's the same bug, the gnome issue is completely different.
I'm very familiar with how the gnomes are supposed to act. Usually, I pick them all up and sell them after Harvestfest is over. However, in this instance, at least one of the gnomes become an immovable object. I can't pick it up or interact with it at all. I can shift-click it and debug it but that won't work either. So it just stays there, unmoved. However, on following Harvestfests, it begins to act like a normal gnome and teleports around with the others; however, I also can't give them offerings. This has happened twice, resulting in 5 gnomes constantly teleporting into my tiny single dorm room.
In my first playthrough, I graduated right after Harvestfest so my first sim left the gnomes there. When my second sim (her child) attended the same college, the three gnomes were there and I sold the two I could and that's when I first noticed the one immovable gnome. After that Harvestfest was over, I was again able to only sell two of the three new gnomes, resulting in TWO completely immovable and non-interactable gnomes in the dorm. I assume if I continue on this playthrough, it will continue leaving one immovable gnome every Harvestfest until the whole place is just filled with immovable gnomes.
@crinrict I've updated my post to be just gnome-related and added a few additional details.
The permanent gnomes have only occurred in the Wyvrnn Dorm. I have celebrated Harvestfest in a house in the same playthrough after my first two sims graduated and the gnomes acted as they normally would and I was able to put all three in my inventory. I also celebrated a Harvestfest in the opposing college dorm (I can't recall the name) and I was able to put all three of those gnomes in my inventory, also. As far as I can tell, this may be a Wyvrnn Dorm exclusive bug.
@simvasion I wasn't aware of that! I suppose one of the gnomes could be, he's one I've never seen before and is holding what I thought was bread of some sort but could possibly be a flat surface to serve as an end table. But that still doesn't make sense in a dorm that I'm completely unable to move or interact with him to the point that he blocks access to my own bed. However, the second gnome that froze in place was a different gnome wearing an intertube.
