Discrepancy in the number of trajectories parsed from the bridge tfds dataset

[Wolfwjs]

I have parsed all the bridge-train.tfrecord-xxx-of-01024 files from the bridge dataset, but I only obtained 25,460 trajectories. However, the bridge v2 mentions that there are a total of 60,000 trajectories. Can you please explain the reason for this significant difference in the number of trajectories?

[LukeLIN-web]

I thought it is much more than 60 000 ...

Dataset Size = 2135488 Examples ,why
n_train_examples=len(train_dataset)