[CEM] Shulker boxes render incorrectly in inventory

[gXLg]

Description of Issue

Depending on the texture path in java part model file, the textures of shulker boxes are being rendered wrong. Either it's my mistake, or optifine's.

Files

/assets/minecraft/optifine/cem/

shulker_box.jem

{
  "models": [
    {
      "id": "shulker_overlay",
      "model": "shulker_overlay.jpm",
      "attach": true,
      "part": "lid"
    }
  ]
}

shulker_overlay.jpm

{
    "texture": "textures/entity/shulker/shulker_overlay.png",
    "textureSize": [16, 16],
    "boxes": [
        {
            "coordinates": [-8, -16.01, -8, 16, 0, 16],
            "uvUp": [0, 0, 16, 16]
        }
    ]
}

/assets/minecraft/optifine/random/entities/shulker/

shulker_overlay.properties

textures.2=2
name.2=heart

textures.3=3
name.3=regex:.*

shulker_overlay.png

[empty texture with just one red pixel]

shulker_overlay2.png

[texture with red heart]

shulker_overlay3.png

[empty texture with just one red pixel]

/assets/minecraft/textures/entity/shulker/

shulker_overlay.png

[empty texture with just one red pixel]

The bug

If in the jpm file I specify:

    "texture": "optifine/random/entity/shulker/shulker_overlay.png",

then this renders: You can see every shulker box having a single pixel overlay

If in the jpm file I specify:

    "texture": "textures/entity/shulker/shulker_overlay.png",

then this renders: You can see the shulker boxes rendering correctly when placed, but wrong in the inventory

[ZenithRogue]

The incorrect rendering in the inventory is the only bug here. Everything else is expected behavior.

Random textures are only supported if the texture being randomized is within the texture/entity folder

texture variants are the only ones that belong in optifine/random/entity