I have a lot on sheep near eachother and they do not stack as intended. they are the same color and none have been named with tags. @ClarinetPhoenix can confirm.
The home of Zylo's that these sheep can be found at is "sheep" if needed for stack testing. There are about 100 sheep here and all are the same color(white) and not stacked. I did some testing on my own in the wild of Rising main, if I spawn a bunch of chickens, cows, pigs or sheep via spawnegg, they stack just fine. Even baby chickens spawned from thrown eggs stack. @Zylo31 how did you obtain these sheep?
Not sure who you were talking to @andrewkm @ClarinetPhoenix If you were talking to me and asking where in /wild I got the sheep from, it has been from all over. I have gotten some from as far away as X:-10000, Z:-10000. I have between 250-300 sheep so I don't know the exact spots but I get a couple from here and some from there. I did not have this issue before this last server wipe. My old town in which I had a sheep was on /main with the towns name being Steins_Gate. I did have a sheep stack of about 150, and another stack of maybe 40 with a handful of loose one (Maybe 30 or so) in the pen. I gathered them all the same way. EDIT: I just checked archive town and my large sheep stacks are missing. Maybe because I didn't play for a year or so and my LWC gate I had wasn't locked and someone came and took them but I cannot say 100% why.
I've done some tweeks to the area and the issue seemed to have resolved itself. Some sheep you won't see stacked as they are long distance from each other, however eventually they will once an event triggers stacking. It's hard to explain exactly how the stacking works and when the stacking events fire, but I can assure you it is working as intended. (At least in this specific area.)