Incorrect vertex colors.

[janEntikan]

The vertex colors for a model I'm exporting with Blender 3.1 seems to be displayed with the wrong vertex colors.

blender displays as such:

gltfviewer displays as such:

some online gltf viewer displays as such:

I've been banging my head on this for a bit now, I've even rewritten the gltf loader to its bare bones. Do you have any ideas why this could be happening?

I'll add the model's blend and gltf file:
test.zip