quick slime farm in screenshoots. room is 3 blocks high and a jack-o-lantern for light in floor every 4 blocks. You have to be (I think) more than 28 and less than 124 blocks away for slimes to spawn. Corners of this room a 83,12,304 : 96,12,304 : 96,12,309 : 83,12,329 Multiple slimes here in just a few minutes.
Hey I checked those coordinates and nothing was there just solid rock. If you are using a size other than large then coordinates will be different. The smallest size (classic for instance) forces more spawners and structures into the smaller map to make sure there is plenty of stuff available.
I dug around the area and didn't find the spawners. Are you using the seed Golden Apple
If there is a space after apple or letters are not capitol that can change the seed. And this is on PS4. It use to be the same across consoles but there seems to be issues now so the seeds are not matching across xbox and playstation.