Only the positions of the point cloud data in the ply file got compressed

I converted the point cloud data from the KITTI dataset into ply format. The header of the ply file is shown as follows:
ply
format binary_little_endian 1.0
element vertex 126085
property float x
property float y
property float z
property float reflectance
end_header

I then use draco to compress and decompress this file. In the ply file which contains the decompressed data, it seems that only the positions (x, y, z) are decompressed:

ply
format binary_little_endian 1.0
element vertex 126085
property float x
property float y
property float z
end_header

How to let draco compress other properties (e.g., reflectance) as well?