sdc_paths in Waymo Motion dataset is undefined for use of Waymax

[hz3014]

Hi, I am working on Waymax and there are errors because of lack of revelent Waymo data.
if I try to include sdc_paths in Waymax:

conf = DatasetConfig(
    path='My_path_to_dataset',
    max_num_rg_points=30000,
    data_format=DataFormat.TFRECORD,
    max_num_objects=max_num_objects,
    repeat= 1,
    include_sdc_paths=True,
    num_paths= 1,
    num_points_per_path= 1, )

we got following error:
W tensorflow/core/framework/op_kernel.cc:1828] OP_REQUIRES failed at example_parsing_ops.cc:98 : INVALID_ARGUMENT: Feature: path_samples/arc_length (data type: float) is required but could not be found.

According to previous mantainer of Waymax, this part of data is not publicly available yet. I was wondering if you can release this part of dataset and resolve this error.

Revelent issue: https://github.com/waymo-research/waymax/issues/25