### 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)
}
						a[i] = array;
					} break;
					case CUSTOM_RGBA8_SNORM: {
						Vector<uint8_t> array;
						array.resize(varr_len * 4);
						uint8_t *w = array.ptrw();
						for (uint32_t idx = 0; idx < vertex_array.size(); idx++) {
							const Vertex &v = vertex_array[idx];
							const Color &c = v.custom[fmt];
							w[idx * 4 + 0] = uint8_t(int8_t(CLAMP(int32_t(c.r * 127.0), -128, 127)));
							w[idx * 4 + 1] = uint8_t(int8_t(CLAMP(int32_t(c.g * 127.0), -128, 127)));
							w[idx * 4 + 2] = uint8_t(int8_t(CLAMP(int32_t(c.b * 127.0), -128, 127)));
							w[idx * 4 + 3] = uint8_t(int8_t(CLAMP(int32_t(c.a * 127.0), -128, 127)));
						}
						a[i] = array;
					} break;
					case CUSTOM_RG_HALF: {
						Vector<uint8_t> array;
						array.resize(varr_len * 4);
						uint16_t *w = (uint16_t *)array.ptrw();
						for (uint32_t idx = 0; idx < vertex_array.size(); idx++) {
							const Vertex &v = vertex_array[idx];
							const Color &c = v.custom[fmt];
							w[idx * 2 + 0] = Math::make_half_float(c.r);
							w[idx * 2 + 1] = Math::make_half_float(c.g);
						}
						a[i] = array;
					} break;
					case CUSTOM_RGBA_HALF: {