Quad ordering is incorrect after material downgrading, causing problems with certain block models

[joe-vettek]

Bug Description

In vanilla MC, Mojang allowed modders to overlay textures by means of isotropic blocks, without being affected by z-depth.
An example is the grass block model, which makes layered tinting possible and more flexible.
However, in Sodium, although side coverage is still supported, There is a weird sorting problem here.

Reproduction Steps

1. open minecraft and use version 1.21.1
2. use Sodium
3. use the test resourcepack
   TESTPack.zip
4. place oak leaves or blue stained glass

Log File

None log, because it not crash.
debug.log

Crash Report

crash-2024-11-06_12.14.25-client.txt

[jellysquid3]

Does this issue happen without Iris?

[douira]

I can reproduce without Iris on dev

[douira]

For reference, the result vanilla produces is oak leaves that look like a snow block.

The model is the following:

{
  "parent": "block/block",
  "textures": {
    "particle": "block/oak_leaves",
    "all": "block/oak_leaves",
    "1": "block/snow"
  },
  "elements": [
{
    "from": [0, 0, 0],
    "to": [16, 16, 16],
    "faces": {
      "north": {"uv": [0, 0, 16, 16], "texture": "#all", "cullface": "north", "tintindex": 0},
      "east": {"uv": [0, 0, 16, 16], "texture": "#all", "cullface": "east", "tintindex": 0},
      "south": {"uv": [0, 0, 16, 16], "texture": "#all", "cullface": "south", "tintindex": 0},
      "west": {"uv": [0, 0, 16, 16], "texture": "#all", "cullface": "west", "tintindex": 0},
      "up": {"uv": [0, 0, 16, 16], "texture": "#all", "cullface": "up", "tintindex": 0},
      "down": {"uv": [0, 0, 16, 16], "texture": "#all", "cullface": "down", "tintindex": 0}
    }
  },{
      "from": [0, 0, 0],
      "to": [16, 16, 16],
      "faces": {
        "north": {"uv": [0, 0, 16, 16], "texture": "#1", "cullface": "north"},
        "east": {"uv": [0, 0, 16, 16], "texture": "#1", "cullface": "east"},
        "south": {"uv": [0, 0, 16, 16], "texture": "#1", "cullface": "south"},
        "west": {"uv": [0, 0, 16, 16], "texture": "#1", "cullface": "west"},
        "up": {"uv": [0, 0, 16, 16], "texture": "#1", "cullface": "up"}
      }
    }]
}

[douira]

Possibly related to #2810?

[joe-vettek]

Possibly related to #2810?

i think yes, but not need Continuity

[joe-vettek]

@jellysquid3 yes, iris is not need in fact