### Godot version

4.1 RC3

### System information

Windows 11 AMD Ryzen 5950x

### Issue description

Actually should be pretty simple, as of commit: https://github.com/godotengine/godot/commit/1c93606e470f0cad5f14af104ccb89a95a89931c

SurfaceTool's add_triangle_fan() maps its parameters like so:
`add_triangle_fan(p_vertices, p_uv2s, p_colors, p_uv2s, p_normals, Variant(p_tangents));`

As you can see its using **p_uv2s** as the 2nd _and_ 4th parameters, and isn't using **p_uvs** at all which ought to be the 2nd parameter. The 2nd parameter at the moment does nothing at all.

As a result I had to change my code from:
`surface_tool.add_triangle_fan(vertices, [uvs[0], uvs[1], uvs[2], uvs[1], uvs[3], uvs[2]])`
To:
`surface_tool.add_triangle_fan(vertices, [], [], [uvs[0], uvs[1], uvs[2], uvs[1], uvs[3], uvs[2]])`

### Steps to reproduce

Use add_triangle_fan and place your UVs as the 2nd parameter, your mesh will be black. When you change your uvs to the 4th parameter, it correctly maps.

### Minimal reproduction project

Should be trivial to reproduce (and to see why it's broken in this commit)
const tbool bIsOrientationPreserving, const int iFace, const int iVert) {
	TangentGenerationContextUserData &triangle_data = *reinterpret_cast<TangentGenerationContextUserData *>(pContext->m_pUserData);
	Vertex *vtx = nullptr;
	if (triangle_data.indices->size() > 0) {
		uint32_t index = triangle_data.indices->operator[](iFace * 3 + iVert);
		if (index < triangle_data.vertices->size()) {
			vtx = &triangle_data.vertices->operator[](index);
		}
	} else {
		vtx = &triangle_data.vertices->operator[](iFace * 3 + iVert);
	}
	if (vtx != nullptr) {
		vtx->tangent = Vector3(fvTangent[0], fvTangent[1], fvTangent[2]);
		vtx->binormal = Vector3(-fvBiTangent[0], -fvBiTangent[1], -fvBiTangent[2]); 
	}
}
void SurfaceTool::generate_tangents() {