if logic error 
https://github.com/NVIDIA/NeMo/blob/e856e9732af79a6ed4bffaa3d709bfa387799587/nemo/collections/asr/parts/utils/decoder_timestamps_utils.py#L399

  if 'EncDecCTCModel' in str(type(asr_model)):
      labels = asr_model.decoder.vocabulary
  elif 'EncDecCTCModelBPE' in str(type(asr_model)):
      vocab = asr_model.tokenizer.tokenizer.get_vocab()
      labels = list(vocab.keys())
      labels[0] = "<unk>"

I found that
'EncDecCTCModel' is in 'EncDecCTCModelBPE'

so I think the order should be changed.

