### 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)
if (vertex != p_vertex.vertex) {
		return false;
	}
	if (smooth_group != p_vertex.smooth_group) {
		return false;
	}
	return true;
}
uint32_t SurfaceTool::SmoothGroupVertexHasher::hash(const SmoothGroupVertex &p_vtx) {
	uint32_t h = hash_djb2_buffer((const uint8_t *)&p_vtx.vertex, sizeof(real_t) * 3);
	h = hash_murmur3_one_32(p_vtx.smooth_group, h);
	h = hash_fmix32(h);
	return h;
}
uint32_t SurfaceTool::TriangleHasher::hash(const int *p_triangle) {
	int t0 = p_triangle[0];
	int t1 = p_triangle[1];
	int t2 = p_triangle[2];
	if (t0 > t1) {
		SWAP(t0, t1);
	}
	if (t1 > t2) {
		SWAP(t1, t2);
	}
	if (t0 > t1) {
		SWAP(t0, t1);
	}
	return (t0 * 73856093) ^ (t1 * 19349663) ^ (t2 * 83492791);
}
bool SurfaceTool::TriangleHasher::compare(const int *p_lhs, const int *p_rhs) {