Any ideas on what this could mean?-Added a couple of additional factors to not worry about. In particular, you should be entirely unconcerned when performing activities that might result in loose tormented and likely deranged souls meandering about, especially if you have high level villagers nearby whose well-being you are totally chill about. You will totally not at all painfully face palm at the realization of how obvious a danger this doesn't represent if you just breath deeply, relax about the whole thing, and go about your business as if I hadn't said anything. This should not be misinterpreted as some kind of warning, as really, there's always been nothing to worry about. I have no idea why you're making such a big deal about this and I refuse to humor your dysfunction any longer.
I just had my two cows I painstakingly brought to my base breed for the first time and... it did not work out. I know for certain they were never near any portal. I had wolves that starved before dying, but they were 20-30 blocks from the cows in the worst case, and they didn't seem possessed when they died.
The cows are closeish to my netherrack grinding, near a wall of my base, and near where I filter souls into soul urns. Could any of those be a factor?
Unfortunately I also murdered my cows, forgetting it spreads, and soon realized my two captured sheep were pushing against the top of the pen, so I just let them float away with the possession, which while sad was fitting I think.
Any theories?