Slime blocks are missing the cullface argument in parts of the slime.json model file. The game renders faces of the block that it shouldn't, as seen in the first picture. The second picture is using the fixed model file that I have provided. The text in that fixed model file is also below. My fix however, causes another problem which is that the center cube isn't rendered in gui's, item frames, or on the ground as an item. So a different fix would be required.
{ "parent": "block/block",
"textures": {
"particle": "blocks/slime",
"texture": "blocks/slime"
},
"elements": [
{ "from": [ 3, 3, 3 ],
"to": [ 13, 13, 13 ],
"faces": {
"down": { "uv": [ 3, 3, 13, 13 ], "texture": "#texture" },
"up": { "uv": [ 3, 3, 13, 13 ], "texture": "#texture" },
"north": { "uv": [ 3, 3, 13, 13 ], "texture": "#texture" },
"south": { "uv": [ 3, 3, 13, 13 ], "texture": "#texture" },
"west": { "uv": [ 3, 3, 13, 13 ], "texture": "#texture" },
"east": { "uv": [ 3, 3, 13, 13 ], "texture": "#texture" }
}
},
{ "from": [ 0, 0, 0 ],
"to": [ 16, 16, 16 ],
"faces": {
"down": { "uv": [ 0, 0, 16, 16 ], "texture": "#texture", "cullface": "down" },
"up": { "uv": [ 0, 0, 16, 16 ], "texture": "#texture", "cullface": "up" },
"north": { "uv": [ 0, 0, 16, 16 ], "texture": "#texture", "cullface": "north" },
"south": { "uv": [ 0, 0, 16, 16 ], "texture": "#texture", "cullface": "south" },
"west": { "uv": [ 0, 0, 16, 16 ], "texture": "#texture", "cullface": "west" },
"east": { "uv": [ 0, 0, 16, 16 ], "texture": "#texture", "cullface": "east" }
}
}
]
}
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I'm not even sure that this is a bug or an intended thing but I think it would make more sense to be fixed; it would go along with how the faces of all the other translucent objects are rendered if it were fixed.
Affects 1.12.1-pre1.
Affects 1.12.2-pre1, 1.12.2-pre2, 17w43a, 17w43b.
Finally fixed 😃

Relates to MC-105274 as both involve block faces not being culled where they should be.
Good stuff, I never knew this was a bug, I just thought slime blocks naturally looked stupid. Hoping this gets fixed.
Confirmed.