Why pass 'env' when recording eval video while passing 'obs' when recording train video?

[jsrimr]

When I run
python pretrain.py agent=icm domain=walker save_train_video=true,
I encounter an error

  File "/root/url_benchmark/video.py", line 83, in record
    frame = cv2.resize(obs[-3:].transpose(1, 2, 0),

But recording evaluation video is okay.
Then I found that we call .record method differently between training and evaluating.

When we record eval video,

self.video_recorder.record(self.eval_env)

we pass 'env'.

When we record train video,

self.train_video_recorder.record(time_step.observation)

we pass observation.

Is this intended?