### 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)
} else if (fmt == 3) {
				lformat |= CUSTOM_RGB_FLOAT << custom_shift[i];
			} else if (fmt == 4) {
				lformat |= CUSTOM_RGBA_FLOAT << custom_shift[i];
			}
		}
	}
	for (int i = 0; i < vc; i++) {
		Vertex v;
		if (lformat & RS::ARRAY_FORMAT_VERTEX) {
			v.vertex = varr[i];
		}
		if (lformat & RS::ARRAY_FORMAT_NORMAL) {
			v.normal = narr[i];
		}
		if (lformat & RS::ARRAY_FORMAT_TANGENT) {
			Plane p(tarr[i * 4 + 0], tarr[i * 4 + 1], tarr[i * 4 + 2], tarr[i * 4 + 3]);
			v.tangent = p.normal;
			v.binormal = p.normal.cross(v.tangent).normalized() * p.d;
		}
		if (lformat & RS::ARRAY_FORMAT_COLOR) {
			v.color = carr[i];
		}
		if (lformat & RS::ARRAY_FORMAT_TEX_UV) {
			v.uv = uvarr[i];
		}
		if (lformat & RS::ARRAY_FORMAT_TEX_UV2) {
			v.uv2 = uv2arr[i];
		}
		if (lformat & RS::ARRAY_FORMAT_BONES) {