### 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)
begun = false;
	primitive = Mesh::PRIMITIVE_LINES;
	format = 0;
	last_bones.clear();
	last_weights.clear();
	index_array.clear();
	vertex_array.clear();
	material.unref();
	last_smooth_group = 0;
	for (int i = 0; i < RS::ARRAY_CUSTOM_COUNT; i++) {
		last_custom_format[i] = CUSTOM_MAX;
	}
	skin_weights = SKIN_4_WEIGHTS;
}
void SurfaceTool::set_skin_weight_count(SkinWeightCount p_weights) {
	ERR_FAIL_COND(begun);
	skin_weights = p_weights;
}
SurfaceTool::SkinWeightCount SurfaceTool::get_skin_weight_count() const {
	return skin_weights;
}
void SurfaceTool::set_custom_format(int p_channel_index, CustomFormat p_format) {
	ERR_FAIL_INDEX(p_channel_index, RS::ARRAY_CUSTOM_COUNT);
	ERR_FAIL_COND(!begun);
	ERR_FAIL_INDEX(p_format, CUSTOM_MAX + 1);
	last_custom_format[p_channel_index] = p_format;
}
Mesh::PrimitiveType SurfaceTool::get_primitive_type() const {