To quote Greg the Garlic Farmer from Epic NPC Man... "My sheep have run amok!". I just upgraded and am running 1.19.2 and my sheep were having a jolly time exploring outside their barn! It's winter in my world so I thought maybe the snow was letting them get over the fence but then I saw them literally just walking up onto the walls, which are three blocks high! I knew I should have finished that barn before winter and got the roof on it! I saw it says above that sheep shouldn't be able to climb three block walls in 1.19.2 so just wanted to post that it looks like they still can.
Loving 1.19 though - great work team Vintage!